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https://www.quora.com/What-does-a-triangle-symbol-in-math-represent
https://www.rapidtables.com/math/symbols/Basic_Math_Symbols.html
https://en.wikipedia.org/wiki/List_of_mathematical_symbols
https://en.wikipedia.org/wiki/Therefore_sign
https://hsm.stackexchange.com/questions/5166/who-first-defined-the-equal-delta-or-delta-over-equal-triangleq-symbol
https://math.stackexchange.com/questions/5076/what-does-%E2%88%87-upside-down-triangle-symbol-mean-in-this-problem
https://www.mathsisfun.com/geometry/symbols.html
https://www.physicsforums.com/threads/what-does-the-triangle-equals-sign-mean.367103/
https://searchdatacenter.techtarget.com/definition/Mathematical-Symbols
https://study.com/academy/lesson/what-is-delta-definition-lesson-quiz.html
http://www.tmrfindia.org/sutra/v2i17.pdf
https://en.wiktionary.org/wiki/%CE%94
https://sciencing.com/delta-math-6678201.html