As a result, the fillers and drains on the aircraft carry clear symbols, distinctive in color, shape and letter, to keep a confused ground crewman from inadvertently blowing himself up ...

Pineapples, in all their forms, whether it’s a towel clip or hung on the handle of your cabin door, is the symbol used to signal you’re interested in swinging. Getty Images You can tell an ...

If you see a referee hold up a "X" symbol above their head with their arms, it means a wrestler has been injured in the ring and the match needs to come to a stop before its pre-determined conclusion.