question: why do you still feel a ring after you’ve taken it off?
comment: Residual nerve signals? It also happens when you ride a swing and then you stand up bu tit still feels like your butt is sitting down
passages: Vaginal rings are easily inserted and removed. Vaginal walls hold them in place. Although their exact location within the vagina is not critical for clinical efficacy, rings commonly reside next to the cervix, and the deeper the placement in the vagina, the less likely the ring will be felt. Rings are typically left in place during intercourse, and most couples report no interference or discomfort. In many cases, neither partner feels the presence of the ring. Rings can be removed prior to intercourse, but, in the case of the contraceptive NuvaRing, only for one to three hours to maintain efficacy of birth control. If the ring is out for more than 48 hours, back up contraception is necessary for seven days. It typically takes between one and two months for a user's cycle to return to normal after the use of a vaginal ring is stopped.
   Most devices are equipped with an elastic band or some type of tension adjustment to pull the skin away from the glans. As the tension is applied, the natural process of mitosis is stimulated.
  
  Some restoration devices are more comfortable or more effective than others. In some cases where there is too little skin to pull onto the gripping surface, pressure must be applied to the glans when applying the device. Most devices and weights are easily washed and can be reused each day.
  
  Section::::Tape-less devices.
  
  Section::::Tape-less devices.:Dual Tension Restorer (DTR).
   Insertion of the ring is comparable to insertion of other vaginal rings. The muscles of the vagina keep NuvaRing securely in place, even during exercise or sex. Women can check the birth control ring periodically with their finger. In rare instances, NuvaRing may fall out during sexual intercourse, while straining before or during a bowel movement, or while removing a tampon.
   Section::::Benefits.
  
  While ringing artifacts are generally considered undesirable, the initial overshoot (haloing) at transitions increases acutance (apparent sharpness) by increasing the derivative across the transition, and thus can be considered as an enhancement.
  
  Section::::Related phenomena.
  
  Section::::Related phenomena.:Overshoot.
  
  Another artifact is overshoot (and undershoot), which manifests itself not as rings, but as an increased jump at the transition. It is related to ringing, and often occurs in combination with it.
   Early ring counters used only one active element (vacuum tube, valve, or transistor) per stage, relying on global feedback rather than local bistable flip-flops, to suppress states other than the one-hot states, for example in the 1941 patent filing of Robert E. Mumma of the National Cash Registor Company. Wilcox P. Overbeck invented a version using multiple anodes in a single vacuum tube, In recognition of his work, ring counters are sometimes referred to as "Overbeck rings" (and after 2006, sometimes as "Overbeck counters", since Wikipedia used that term from 2006 to 2018).
   "Wearable" devices are being tested and developed that involve transcutaneous stimulation and do not require surgery. Electrical impulses are targeted at the aurical (ear), at points where branches of the vagus nerve have cutaneous representation; such devices had been tested in clinical trials for treatment resistant major depressive disorder as of 2017.
  
  Section::::History.
  
  In 1997, the US Food and Drug Administration's neurological devices panel met to consider approval of an implanted vagus nerve stimulator (VNS) for epilepsy, requested by Cyberonics (which was subsequently renamed to LivaNova).
  
  The FDA approved an implanted VNS for TR-MDD in 2005.
   It is most common for a one-dimensional medium to form a closed circuit, i.e. a ring. For example, the Mexican wave can be modeled as a ring going around the stadium. If the wave moves in one direction it will eventually return to where it started. If, upon a wave's return to the origin, the original spot has gone through its refractory period, then the wave will propagate along the ring again (and will do so indefinitely). If, however, the origin is still refractory upon the wave's return, the wave will be stopped.
   Section::::Theory and design.:Vacuum applications.
  
  In vacuum applications, the permeability of the material renders the point contacts unusable. Instead, higher mounting forces are used and the ring fills the whole groove. Also, round back-up rings are used to save the ring from excessive deformation 
  
  Because the ring feels the ambient pressure and the partial pressure of gases only at the seal, their gradients will be steep near the seal and shallow in the bulk (opposite to the gradient of the contact stress 
   In the case of accidental expulsion, the manufacturer recommends rinsing the ring with lukewarm water before reinserting. If not done correctly, the risk of pregnancy is increased. Birth control efficacy is reduced if the ring is removed, accidentally expelled, or left outside of the vagina for more than three hours. If left outside of the vagina for more than three hours, the device is to be rinsed and reinserted immediately. If this occurs, the manufacturer recommends that a backup method of birth control be used until the ring has been used continuously for a subsequent seven days.
  
  Section::::Medical use.:Benefits.
   Section::::Faux tension settings.
  
  Some rings, while advertised as and having the appearance of tension rings, in fact have a bridge holding the ring together underneath the jewel. These are not true examples of a tension set ring, but are a good affordable alternative to true tension settings. Though the wearer knows it is not a true tension setting, it looks like one to the casual observer. This is also a good option for a mass produced ring.
  
  Section::::History.
   Over time, prongs may get worn out or become loose. Getting the ring checked regularly is a good idea in order to prevent any accidental loss of your mounted gemstone. Some effective ways include using a 10X loupe to check for gaps between prongs and gemstone, listening for sounds made by loose gemstone and taking it to a professional jeweler once every 6 months for checks.
  
  Section::::Tiffany design and trademark.
   Section::::Jewelry.
  
  Both barbells and rings can be worn in frenum piercings, both as initial jewellery and on an ongoing basis. Sometimes, when rings are worn, the diameter of the ring is specifically chosen so that the ring can be worn encircling the penis. A wide variety of chastity devices make use of frenum piercings to secure themselves to the penis, as part of fetish or BDSM activities.
  
  Section::::History and culture.
   Soreness is likely to persist for the first couple of months with the worst occurring during the first week or two. Jewellery should not be changed until at least eight weeks after the procedure. Primary healing will usually conclude within six months with full, secondary healing of the fistula complete in 12 to 18 months. Much of the cartilage in the ear receives comparatively little blood flow accounting for the increased healing time and persistent soreness.
  
  Section::::Jewelry.
   ""This ring is made from a palm tree in the Amazon. It is a sign of the alliance with the indigenous cause and with popular causes. Those who carry this ring took these causes as their own. And its consequences. Would you use the ring? Look, this commits you, you know? Many, because of this commitment, were killed.""
   BULLET::::- At an early date the small keys which contained filings from the chains of St. Peter were welded to a band of metal and worn upon the finger as reliquaries.
  
  BULLET::::- An ancient custom to this day at the Saint Catherine's Monastery on Mount Sinai in Egypt, is to place a ring on the finger of St. Catherine of Alexandria and then wear it as a "eulogia" (blessing).
   Rings for ED must be able to be placed in position while a pump is connected; the erection is lost as soon as vacuum is removed unless the ring is already in place. This rules out most types other than simple elastic rings.
  
  Section::::Materials and types.:Specialized underwear.
   The Iron Ring is worn on the little finger of the working (dominant) hand. There, the facets act as a sharp reminder of one's obligation while the engineer works, because it could drag on the writing surface while the engineer is drawing or writing. This is particularly true of recently obligated engineers, whose rings bear sharp, unworn, facets. Protocol dictates that the rings should be returned by retired engineers or by the families of deceased engineers. Some camps offer previously obligated or "experienced" rings, but they are now rare due to medical and practical complications. 
   Hoffman et al. (1985) reports that mean bacterial counts were higher on ring-wearing fingers (1600 compared to 180 for non-ring wearing fingers). They survey included 50 nurses working on medical and surgical wards who permanently wore rings and studied the microorganisms isolated from skin under the rings. Forty percent of these nurses (20 nurses) had Gram-negative bacilli on the skill under their rings, and 16 of these 20 nurses still had most strains each time the nurses were sampled during the five-month study. A similar study found that even after washing hands with povidone-iodine, those with rings had higher bacterial counts than those without.
   A number of studies have shown that ring wearing increases the likelihood of bacterial contamination; in particular these studies have demonstrated that the skin under rings can be more heavily colonized than areas of skin without rings and can be a major contributor to hand contamination.
   Joan Morris and William Bolcom recorded the song as part of their 1974 debut album, "After the Ball".
  
  In 1962, Ray Stevens referenced the expression in his comic song, "Ahab the Arab", in which Ahab's girlfriend Fatima wore "rings on her fingers and bells on her toes and a bone in her nose, ho ho."
   The flight ring is later featured in an episode of "Supergirl". In "Solitude", Superman kept the ring on a pedestal at the Fortress of Solitude. The ring disappears from the Fortress without explanation during the fourth season, after the Legionnaire Braniac 5 becomes a regular character.
  
  In "Supergirl"s third season's tenth episode titled "Legion of Superheroes", Mon-El, Imra Ardeen, and Brainiac 5 don the rings before going to fight Reign. Supergirl is given a ring by Mon-El during the season finale as a parting gift.
  
  Section::::See also.
  
  BULLET::::- Power Ring
  
  BULLET::::- Lensman
  
  BULLET::::- Quantum Bands
  
  BULLET::::- Power Prism
  
  BULLET::::- Osira
   After several thousand years of ring manufacture the total number of styles produced is vast. Even cataloging the rings of a single civilization such as the Romans presents a major challenge. As a result, the following list should be considered to be very limited.
  
  Section::::Styles.:Notable individual rings.
  
  BULLET::::- Iffland-Ring, held by a series of German-language actors since the 18th century, presently held by Swiss actor Bruno Ganz
  
  BULLET::::- Hans-Reinhart-Ring, a Swiss theatre award
  
  BULLET::::- Ring of the Fisherman, the signet ring of the Pope
  
  BULLET::::- Chequers Ring Ring that belonged to Elizabeth I of England
   Ten objects, among them one of the inscribed rings, were stolen shortly after the find was made, and when the remaining objects were recovered, it was discovered that the other ring had been cut into at least four pieces by a Bucharest goldsmith, whereby one of the inscribed characters had become damaged to the point of illegibility. Fortunately, detailed drawings, a cast, and a photograph made by London's Arundel Society of the ring before it was damaged survive, and the nature of the lost character can be established with relative certainty.
   Piercing migration
  
  Piercing migration is the process that occurs when a body piercing moves from its initial location. This process can be painful or go unnoticed, until it has progressed. Given enough time, a ring may migrate entirely outside of the skin, although it may only migrate a small amount and come to rest.
  
  Section::::Potential causes and effects of migration.
   The information that helix piercings do not have nerve endings and do not hurt is completely false. They do hurt like any other cartilage piercing, and, when you bump or tug on them by accident during healing it can be extremely painful. However, when they are just sitting there not being irritated or touched, they do not hurt at all. Just be careful of bumping them during healing, which can take up to 1 year.
  