The common symbols for chord notation are:

Major: Maj, Maj7, Ma7, M7,∆7, or all of these symbols with 9, 11, or 13 replacing the 7 (also if the numer 6 is present, with or without an M symbol in front of it. The scale of choice would be Ionian or Lydian.

Minor: min, min7, mi7, m7, -, -7, or all of these symbols with 9, 11, or 13 replacing the 7. The scale of choice would be Dorian or Aeolian, possibly Phrygian, but not likely.

Dominant: 7, 9, 11, 13 (not 6, that would fall under the Major category). The scale of choice would be Mixolydian.

Half-Diminished: , m7(b5), m7(-5), -7b5. The scale of choice would be Locrian (you can also use Locrian #2, which is the same as the Locrian, but you raise the 2nd note by a half-step).

Diminished: o, dim. A bit tricky...this is the half-diminished chord with the 7 lowered by yet another half-step, essentially making it a 6. You can also just play root, b3, b5 and leave it at that. Both are perfectly acceptable, so much in fact that people seldom know there's a difference between half- and full diminished.

Augmented: +, +5, Aug. This is another tricky one. It's basically a Dominant chord with the 5 raised by a half-step. The chord of C+ would be C E G# Bb. A good scale for this would be what's called a whole tone scale. In C it would be C D E F G# A Bb C...all whole steps from each other.

Unfortunately we really don't have a consensus about exactly which chord symbols are correct. The result is a rather colorful collection of different marks. No problem...if it sounds good, it is good - if it sounds bad, it's the guitar players fault.