Intervals names are made of 2 elements: Quality and Degree.
Intervals have a shorthand writing, which is achieved by leaving just the first letter of the quality (notice if it's capitalized) and a single number representing the degree.
Following are few examples:
| Full-name | Shorthand | Alt-name |
|---|---|---|
| Perfect 1st | P1 | Unison |
| minor 3rd | m3 | |
| Major 3rd | M3 | |
| Perfect 4th | P4 | |
| Augmented 4th | A4 | |
| diminished 5th | d5 | |
| Perfect 8th | P8 | Octave |