Dentistry notation symbols

[philip chastney]

 the symbols in your message are all APL symbols,not dentistry symbols at all
/phil

    On Friday, 8 April 2022, 19:39:06 UTC, Jonathan Chan via Unicode <unicode at corp.unicode.org> wrote:  
 
 What are code points U+23BE..U+23CC in Miscellaneous Technical used for?
⎾⎿⏀⏁⏂⏃⏄⏅⏆⏇⏈⏉⏊⏋⏌
They're all named DENTISTRY SYMBOL LIGHT..., and the Standard only says they're for dental notation:

Dental Symbols. The set of symbols from U+23BE to U+23CC form a set of symbols from JIS X 0213 for use in dental notation.

According to Wikipedia the first two and the last two are used in Palmer notation, but it doesn't explain what the rest of them are used for. The only historical document I could find with some sort of explanation is document N2195, but it only explains how they're used and not what they're meant to represent, why they need to exist, or what the circle, triangle, and tilde mean. Based on some cursory searching it doesn't seem like those symbols are standard in modern dental notation either.
Jonathan  
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