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How to produce symbol like this: omega-pi

Is this a special form of \varpi, 'double upsilon' or omega?

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In my opinion, this is the default w in math mode. – Sigur Apr 2 '13 at 22:26
up vote 10 down vote accepted

See the image below: it is the default w in math mode.

enter image description here

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you've saved my day, thank you – egor7 Apr 2 '13 at 23:32

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