https://en.wikipedia.org/wiki/Greek_letters_used_in_mathematics,_science,_and_engineering https://en.wikipedia.org/wiki/Greek_letters_used_in_mathemat... Ω rep

https://en.wikipedia.org/wiki/Greek_letters_used_in_mathematics,_science,_and_engineering https://en.wikipedia.org/wiki/Greek_letters_used_in_mathemat... Ω represents: an asymptotic lower bound notation related to big O notation \delta represents: a variation in the calculus of variations