<Li> It causes problems for some Scandinavian languages--Ø is used as a letter in the Danish, Faroese, and Norwegian alphabets, where it represents (ø) or (œ). </Li> <Li> It also resembles the Greek letters Theta and Phi in some fonts (although usually, the slash is horizontal or vertical, respectively). </Li> <Li> The symbols Ø and "∅" (U + 2205) are used in mathematics to refer to the empty set . </Li> <Li> "⌀" (U + 2300) is Unicode's code point for the diameter symbol . </Li>

What does a 0 with a line through it mean in math