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-glyph Contact the author of the font.
Why ?
FontOrg don't work on windows 10.
Misskawa said 
On ne peut pas la trouver sous un autre nom comme pour Disney ou Coca Cola ?
Non
It's good.
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