Today, I came across a potentially useful site, Shapecatcher.com which lets you draw a shape and produces a list of potential Unicode matches. Cool, at the very least.
Android users, please note that the default Android browser may not show all the characters used for this web page. Sorry, that's out of my control.
It is also useful to have a list of "entites" for use in HTML coding: W3C Entities List
Another Entities list and one for Compose Key Codes.
||Type ctrl-shift-u (release - then type) and enter key
|¿, ¡ , ‽, ⁂, «, », †||00bf, 00a1, 203d, 2042, 00ab, 00bb, 2020||inverted question mark
inverted exclamation point
Interrobang -and- asterism
||lower case e accent grave, with circumflex
||lower case e accent acute and cap
||nyay for Spanish
||c with cedilla for French
|Ä, ä, Ö, ö, Ü, ü||00c4, 00e4, 00d6, 00f6, 00dc, 00fc
||German umlauts (as diaeresis)
|™, ©, ®
||2122, 00a9, 00ae
||trademark, copyright, registered
|—, ₂||2014, 2082
||em dash, subscript 2 CO₂
|≈, ≠||2248, 2260
||approximately equal to, not equal to
|♽, ♼||267d, 267c
||recycle symbol in circle, and inverted
|♳, ♴, ♵, ... ♹
||2673, 2674, ..., 2679
||recycle plastic #1, 2, etc. to 7
||check mark, check in box
||rain and umbrella
|¢, €, £, ¥
||00a2, 20ac, 20a3, 00a5
||US cent, euro, UK Pound, Yen/Yuan
|⇦, ⇧, ⇨, ⇩
||21e6, 21e7, 21e8, 21e9
||pilchrow (paragraph) mark
Please realize that Unicode is being updated over time. Another factor is that various fonts may not have all the symbols that others do.
On April 30, 2021, @cadadr, a person posting with Mastodon in the fediverse, posted that he had found a "new" ornate set of parentheses which have a floral motif centered on the curve. It took some searching through the fonts I have installed on my system, but the following illustration highlights the forms I was able to find.
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