Add "equals" icon

[Makistos]

Seems like there are icons for different calculations (add, subtract etc) but no equals sign that I can spot. This could well be the same style as the bars icon but with one less bar.

In that case it would also nicely work with the minus sign as a triplet - which is why I was looking for this sign in the first place. As in "less detail" - "more detail" - "most detail".