The circle with a line going vertically through it is the Greek letter phi. In set theory, it represents the empty set (the set that.contains no elements) In algebra, it represents "no solution."
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I'm guessing that it's the null-set symbol, ∅. This symbol means, "the set with nothing in it".
However, a circle with a vertical line could also be phi, as indicated above. It's just a greek letter - a variable used for angles in math sometimes.
However, a circle with a vertical line could also be phi, as indicated above. It's just a greek letter - a variable used for angles in math sometimes.
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It is the greek letter phi. It is often used to represent the golden ratio, the angle between a position vector terminating at a point in R³ and the vertical axis, and about 100 other things since math tends to overuse and abuse its own symbols.
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The Greek letter phi?(Φ)