Is there any way to programmatically tell whether a given character is a letter or letter-like form (see this reference page for what I mean)?
One idea I had was to use
FrontEnd`UndocumentedTestFEParserPacket, to test whether the syntax parser would split the string (i.e. test whether
char <> "a" is split), which seems to work. But I am looking for a more provably correct and less undocumented solution if at all possible.
Another idea was to simply check the reference page for a given character/preprocess the full list given above to build a "database" by hand, but it feels like there could be a more straightforward way, hence this question.