Request for glyph: � (U+FFFD)

[PhMajerus]

The � (U+FFFD) "Replacement Character" is used in Unicode to represent a missing, unknown, lost, or invalid character.
For example, when converting to a specific code page, some conversion function and utilities will use � for characters that do not exist in the target code page. If a transmission error occurs in a text stream, lost characters may be replaced by �. When a graphical API must render text and some of the codepoints to display do not exist in the selected font, it will often replace them with � as well to clearly show those are missing.

Here's a design suggestion:

And I would add  (U+FFFC) along with it:

Note this glyph is often designed as a large [OBJ], but terminals consider it a single cell width, so this design fits without overflowing.

[PhMajerus]

Characters  and � are now included in PR #144.