Every character the Tagsu display can show, and the code the editor sends for it. The characters are built into the display itself rather than the badge's firmware, so this is the display's own character set, and anything in it can be typed in the editor.
The font was built from photographs of a real Tagsu showing every code from
0x20 to 0xFF, read dot by dot. The editor previews your
screens with the same font, so what you see there is what the badge shows.
Checking it against a real Tagsu
The probe builds 14 screens, one per block of 16 codes, each showing the codes on the top row and which block it is underneath. Send it to your own Tagsu to see the table above on the real display.