Surprisingly enough, not actually the letter m. A Unicode syⅿbol for ⅿilli, but looks exactly like an m. Looks weird on most fonts. Uppercase is Ⅿ. Similar to Ⅰ, Ⅴ, Ⅾ, ⅴ, ⅽ, Ⅹ, Ⅼ, ⅾ, Ⅽ, ⅰ, ⅹ and ⅼ. (Yes, the spaces are exactly the saⅿe)
ⅿ by \/+{[me]}+\/ May 3, 2023
that lightskin was so M
M by UK slang REAL June 23, 2023
M is the Luigism version of "L" that ordinary people use, meaning loser because M*rio is a loser and much more.
M by The Luigi Pope July 12, 2023