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18:23 ·
This ideogram is used in some mathematical, geometrical and other sign systems with the meaning isomorph with or congruent with, i.e. of the same form as. It can also mean approximately equal to. Taking the equals sign,  , as a starting point, the upper line has been replaced by the sign for a complete oscillation,  .
This implies an equality in one dimension and a variance in the dimension of quantity.
Compare with  for frequency.
In electrical contexts  signifies alternating current, which also can be drawn ,  , and  .
The sign often appears in unexpected places, for example in  , one of the many Jesus monograms of the type beginning to be used in the seventh century. In Latin the monogram IHS can be interpreted as I(n) H(oc) S(igno) vinces, that is, In This Sign You Will Be Victorious, or I(esus) H(ominem) S(alvator), that is Jesus, Saviour of Men. As is the sign representing a complete oscillation, it might be that in refers to Christ's defeat and victory, death and resurrection.
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