Is there a “glyph not found” character?

Question

Let\'s assume we have a text that contains a Unicode character that cannot be displayed because our font has no corresponding glyph. Usually, a placeholder is displayed inst

Answer 1

There are 3 possible characters for glyph not found.

Check in Microsoft specification, topic Shape of .notdef glyph, https://docs.microsoft.com/en-us/typography/opentype/otspec170/recom#shape-of-notdef-glyph