The symbol is called DELTA and looks like a triangle.
-----> Δ <----
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The symbol that you describe seems to be the greek letter Phi. It is normally used to indicate a variable that is an angle, just as x is used to indicate a variable that is a numeric quantity.
The power set of the empty has one member, which is the set whose member is the empty set . {phi} ( Actually the symbol for the empty set is the Norwegian letter O which resembles the Greek letter phi but is a different symbol )
The "Pre-Algebra with Pizzazz" Greek decoder is a fun activity often found in math workbooks that involves solving math problems to decode a message written in Greek letters. To find the answer, students typically complete various pre-algebra problems, and each correct answer corresponds to a letter or symbol in the Greek alphabet, ultimately revealing a phrase or message. The specific answer varies depending on the problems presented in the workbook.
The ancient Greek mathematician Pythagoras is usually creditted for the discovery of the ratio of circumference to radius of circles. That is, Circumference = 2 * Pi * Radius. The number Pi represents (3.1415....) is named after him.
The variables in such expressions are letters, or some other special symbol (for example, Greek letters, or a combination of letters) - in this case, it's "t".