C'est à l'auteur de la police qui devrait corriger sa fonte.
In practice, the □ codepoint is used as a Failure Glyph. The U+FFFD REPLACEMENT CHARACTER is used to replace an unknown, unrecognized or unrepresentable character.
The .notdef glyph is the glyph that is used to indicate to the user that a glyph is missing in a font.
https://docs.microsoft.com/en-us/typography/opentype/spec/recom#glyph-0-the-notdef-glyphAlle Zeitangaben sind CEST. Es ist jetzt 02:04