There are various Chord Symbols that can be combined to indicate many different types of chords.
Basic Chord Symbols:
Letter Name (e.g., C) = Major chord
m = minor chord
+ = Augmented chord
o = diminished chord
Seventh Chords:
7 = minor seventh
M7 = Major seventh
Ø = half-diminished chord
o7 = diminished seventh chord
Extended Chords:
9 = Ninth chord
11 = Eleventh chord
13 = Thirteenth