The most efficient use of expressing laughter in chat messages. Originally used only by
Age of Empires II players, but it is now widely accepted (in their minds).
Sources:
"11 Equals 'lol'
111 Equals 'lmao'
1111 Equals 'LMAO'
11111 Equals 'OMG lol lol'
111111 Equals.. whatever you want it to be, for intstance: 'LOL ROFL LMAO WTF 11' "
- T90Official, Age of Empires II YouTuber
"11, Synonymous in use to terms such as "lol" or "kek", a reference to an audio taunt in the 1999 video game Age of Empires II with the purpose of expressing laughter or amusement."
Source: AoE2
Reddit user Hjoerleif
"11 Is a taunt from Age of Empires 2 that, when used in chat, plays an audio clip of someone laughing. It's basically lol before lol or
the lol of Age of Empires 2 and all of it's players. 11"
Source: AoE2 Reddit user dimanor3