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7th Chord Notation

Here is a list of common ways you will see the various 7th chords notated and abbreviated.

I'll use C chords to demonstrate.

Major 7th: Cmaj7, CM7
Minor 7th: Cmin7, Cm7
Dominant 7th: Cdom7, C7
Half-Diminished 7th: Cø7, Cm7b5
Full-Diminished 7th: Cdim7, Cº7, Co7

Note: The full-diminished will often have a degree symbol (º) and the half-dimished will often have a slash through the degree symbol.