Many people online have named their cat this Unix command, and told people to run it in their terminal.
(spoiler alert; It's a fork bomb, but for your ram)
Person 1: *sends image with caption of "This cat's name is :(){:|:&};: you should type his name on your linux's terminal"*
Person 2: (likely a beginner) "uhh ok"
Person 1, seeing Person 2 go offline: "lol he actually fell for it"
A symbol used by fans of the band twenty one pilots. The symbol has no widespread meaning, but is more supposed to have a personal meaning to the user. It has been connected to the song "Kitchen Sink" and is all over tøp merchandise.