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The Upside down T symbol indicates perpendicular lines.

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Q: In Math what does the upside down T mean or stand for?

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That's a u

In sets it means intersects. like what is common in both sets

The only "mathematical" (it's really more geometrical) symbol I can think of fitting the description means "perpendicular."

IgLoo

It is used in set theory to indicate intersection. The intersection of two sets, A and B, is the set of all elements that are in A as well as in B.

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That's a u

In sets it means intersects. like what is common in both sets

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Sounds highly unlikely. But did you mean 'the chicken upside down', or 'the egg upside down'?

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Answer it

The only "mathematical" (it's really more geometrical) symbol I can think of fitting the description means "perpendicular."

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IgLoo

pnworhd is an upside down pyramid. If you take pnworhd in script and turn in upside down you will get pyramid

It is used in set theory to indicate intersection. The intersection of two sets, A and B, is the set of all elements that are in A as well as in B.

Anokatoprosopus means upside-down face (i.e. some aliens or monsters have upside-down faces).