Man pages matching name charmap in section 1:

Charmap.1.en	debian 10 / charmap.app
charmap.1.en	debian 10 / gucharmap
Charmap.1.en	debian 11 / charmap.app
charmap.1.en	debian 11 / gucharmap
Charmap.1.en	debian 12 / charmap.app
charmap.1.en	debian 12 / gucharmap