Is 纟 obtained by simplification of 糸 ？ Neither纟 nor 糸 are used as words in modern Chinese, i know the word for silk is 丝( trad 絲).
Many radicals in the list of 214 kangxi radicals have both traditional and simplified character, but that one is not clear about what it is, simplified or traditional.
Any information about etymology or origin of 纟 and 糸  is welcome  :-)
纟 derived from 糸, which is the silk. (looks very like)
Like many other simplified Chinese Characters, 纟comes from 草书, such as

訁 -&gt; 讠
飠 -&gt; 饣
糹 -&gt; 纟
釒 -&gt; 钅

most of the characters with 纟are related to textiles ( 纺织品 ) , such as
“丝”、“线”、“经”、“纬”、“绑”、“纹”、“纷”、“纱”、”“绞”
refer to: https://baike.baidu.com/item/%E7%BA%9F/8457525?fr=aladdin