sss

See also: SSS

English edit

sss (with any number of S's to indicate duration)

(onomatopoeia) The hiss of a snake or other reptile.
- 2017, Brian Fox, The Hollow Rasping of an American Nightmare, page 420:
  "Sss," said the snake.

the hiss of a snake or other reptile

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sss

(mathematics, logic) if and only if; used to show that the predicate that follows it has the same truth value as the predicate that precedes it