Question

what is the name of the sign? urgent​

Answer 1

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_ It is a phi sign.... Φ

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Answer 2

Answer:

Well, this is a Greek Letter called phi( pronounced often as Fi)

And, this letter is often used to represent the golden mean or the golden ratio (the special number in mathematics)

And, sometimes also to represent the polar angles or the azimuthal angles in spherical and cylindrical polar coordinates.

Also, this letter is often used to represent many other physical quantities in physics as well as other numbers.

Hope this helps you (