That’s because of the issue above: Unicode is comprehensive while fonts’ character sets are finite. A digital font typically includes only the characters needed to represent one or more scripts.

As of April 2021, the Google-sponsored noto font kit covers 95% of all non-CJK glyphs, and 32% of all CJK glyphs, for a combined coverage of 54% of the glyphs defined in the Unicode 13 standard.

𝕏 is a Unicode character known as "mathematical double-struck capital X." The new logo is also nearly identical to the lowercase "x" in the Monotype font "Special Alphabet 4." ...

“Google’s open-source Noto font family provides a beautiful and consistent digital type for every symbol in the Unicode standard, covering more than 800 languages and 110,000 characters.” ...

There’s a semi-hidden way to access special symbol sets in Unicode, and a somewhat obscure method of searching for specific symbols across all of macOS’s included Unicode characters. First: ...

However, with AFII, anyone could register characters and symbols by paying the current value of $ 8.6 to $ 86 (about 1080 yen to 10,800 yen), so it was not possible to clarify the meaning of '⍼'.

In the Character set list, select Unicode. 5. In the Group b y list, select All to browse all available characters by font, or select Unicode Subrange to browse characters by category.

During their development work on an international news feed, software engineers at Aloha Browser discovered two Unicode symbols in a non-English language that can crash any Apple device that uses ...