The most popular acronyms stickers:
WTF: What the f***
OMG: Oh my god
LOL: Laugh out loud
BTW: By the way
ROFL: Rolling on the floor laughing
SMH: Shaking my head
IMHO: In my humble opinion
LY: Love you
... and many others
Acronyms are similar to abbreviations, in that they are a shorthand way of expressing an idea. However, unlike an abbreviation which may just be a shortened version of a word, acronyms have to stand for something.
Acronyms are used across every industry, in all walks of life.