https://en.wikipedia.org/wiki/List_of_mathematical_symbols https://en.wikipedia.org/wiki/List_of_mathematical_symbols Also, if I were you, I would always look

https://en.wikipedia.org/wiki/List_of_mathematical_symbols https://en.wikipedia.org/wiki/List_of_mathematical_symbols Also, if I were you, I would always look up introductory textbooks before trying to read math literature. The example you gave is conditional probability; any textbook on probability theory would cover it.