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This question already has an answer here:

In math mode, I would like to create this letter (joint picture)

enter image description here

(it's a omega with a bar very close to it)

marked as duplicate by egreg amsmath Aug 25 '16 at 13:32

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    Maybe you're looking for \varpi – egreg Aug 25 '16 at 13:30
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Ok foud it ! $ \varpi $

should work ...

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