Constant equals sign is generally used when some parameter variables are constants or constant expressions, which always indicates that the relationship has nothing to do with the 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.

other meaning

Triple bond: a triple bond in chemistry, such as C≡C (carbon-carbon triple bond).

Congruence symbol: let m be a positive integer greater than 1, and a and b be integers. If m|(a-b), a and b are said to be congruent with respect to module m, which is denoted as a≡b(mod m) and pronounced as congruent with module b m.

Gossip and divination: the writing of divination in gossip is ≡.

Computer play: Alt+ keyboard 4 1428 (the notebook keyboard is Fn+Alt+4 1428).