There are no commonly recognized symbols that designate complementary and supplementary angles. However, if you are writing a paper that frequently refers to a pair of angles as either complementary or supplementary, you might consider defining your own symbol. If you are stuck with plain text rendering, such a thing might be rather challenging, but there are a myriad of choices if you are going to do typesetting or if you are going to use MathType or MSWord Equation Editor.
Let's say that you are doing plain text. You could put a statement near the front of your paper or perhaps in a footnote that the symbol @ in the context of this paper means "is complementary to." Then you could say at any point < A @ < B and have it mean that "Angle A is complemenatry to angle B".
John
Egw to Beta kai to Sigma
My calculator said it, I believe it, that settles it
