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.