# Symbol similar to \equiv

What's the command for typing 3 lines exactly like \equiv but with index in the middle of top line? Thanks.

EDIT: this is the symbol I meant

• Oct 17, 2014 at 20:07
• Have you tried detexify to look up the symbol of interest? (I must confess not knowing what 'index in the middle of top line" is supposed to look like.)
– Mico
Oct 17, 2014 at 20:08
• I've updated post with image of the symbol. And yes I've tried detexify but no result.
– mezo
Oct 17, 2014 at 20:24
• i'm pretty sure this "precomposed" symbol doesn't exist. you might take a look at \stackrel (basic latex command) or \overset (requires amsmath) to construct it yourself. Oct 17, 2014 at 20:27
• Thanks ;) overset{0}{\equiv} did it.
– mezo
Oct 17, 2014 at 20:31

this does not exist as a "precomposed" symbol. however, amsmath provides a mechanism for creating combinations of this sort -- \overset:
\documentclass{article}
$x \overset{0}{\equiv} y$

when \overset is applied to a single symbol, the proper class of that symbol (e.g., \mathrel, \mathbin) is recognized automatically, so there is no need to specify it.