What is the meaning of... LOL?

Hoy os traigo la palabra LOL. What is the meaning of LOL?

1. It's a famous multiplayer online battle video game League of Legends (LoL).
(Es un juego online famoso, League of Legends)

2. Laughing of Loud/Lots of Laughs. Common expression in any text conversation even face to face conversation. It's used instead of "jajaja" "hahaha". It's used in funnies conversations, a reply to a joke that isn't funny.
(Expresión común que se usa en conversaciones escritas o cara a cara. Se usa en vez de "jajaja". Usada en conversaciones divertidas o como respuesta a una broma que no tiene gracia).

3. LOL? = surprising 
(respuesta a algo que nos causa sorpresa)

Meaning: muerto de risa, reírse mucho, reírse a carcajadas, cuando nos dicen algo y nos causa sorpresa o cuando nos dicen algo y no tiene gracia.

-> I spend my money buying pencils.
- lol?
(¿quee?)

-> ....she fell on the floor and then she started to dance.
- lol
(a funny moment)

-> HAHAHA you look like a pumpkin.
- lol
(it isn't funny)