What does 饭圈类 ("rice-ring kind") indicate in 生产这些饭圈类产品? 口号手环、贴纸、小旗子、手幅、胸章……义乌的大小作坊，为4年一度的美国大选，生产这些饭圈类产品，正规名称是总统竞选产品。
义乌再次判定：特朗普连任，2020年04月30日

The above article discusses Trump-themed merchandise and its manufacture in Yiwu (义乌), comparing the 2016 and 2020 US elections.  I'm struggling with the part in bold:

[My translation:] Slogan bracelets, stickers, small flags, placards (?), broaches, …… Yiwu's big and small wordshops, for the once-every-four-years US election, produces these 饭圈类 products.  According to regulations [they are] called president election products.

In the above, I don't understand why 饭圈类 (&quot;cooked-rice-roll kind&quot;) is used here (Google Translate gives &quot;rice ring products&quot;).  It appears to be used metaphorically.
Question: What does 饭圈类 (&quot;rice-ring kind&quot;) indicate in 生产这些饭圈类产品?
(I found the answer while researching this question.  I thought it was interesting, so I'll self-answer.  I welcome further answers.)
Searching for 饭圈类 in Baidu, I stumbled upon a Baidu Zhidao artcle, which gives an explanation.  The second answer is simpler:

饭圈类似粉丝会，大家有共同喜欢的东西，组成了一个圈子。
[My translation:] 饭圈 is similar to &quot;fan group&quot; [粉丝会], everyone has something they commonly like, the group forms a social circle [圈子].

In particular, 饭 in this context does not mean &quot;cooked rice&quot;, but is used because the English word &quot;fan&quot; is written in the same way as the (untoned) pinyin for 饭 (fàn).  Thus, 饭圈 is a &quot;circle of fans&quot;.  And in the article about Trump, it refers to products produced for Trump's circle of fans (or Trump's supporters).