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What mathematical symbols do the three horizontal lines represent?
Identity symbol

Constant equals sign is generally used when some parameter variables are constants or constant expressions, and the congruence relation has nothing to do with variables. For example, the function f(x)≡k means that no matter what the value of x is, the value of this function is always k.

Part of congruence symbol

Two integers A and B are said to be congruent with module M if the remainder obtained by dividing them by integer M is equal.

Write it as a≡b(mod m)

triple bond

Three bonds in chemistry, such as C≡C (carbon-carbon triple bond)

Gossip and divination

Write "≦" in gossip.