Solfege

There are three main categories:

Backwards-compatible solfeges expand on the conventional Do Re Mi (and Do Di/Ra Re RiMa Mi). They use the 7 traditional consonants D R M F S L T. They use traditional vowels plus new ones. See 19edo solfege, plus Andrew Heathwaite's solfeges for edos 17, 22, 31 and 41, and xenwiki user Phylingual's solfeges for edos 26, 29 and 53.

Uniform solfeges are particularly good for large edos like 41 and 53. They are also for rank-2 temperaments. They are closely related to ups and downs notation. To the 7 traditional consonants are added 6 altered consonants: Fr- N- P- Sh- Fl- and Th-. The vowels are non-traditional. There is a uniform vowel sequence for all degrees, hence the name.

Numeric solfeges are good for small edos that aren't heptatonic-friendly, like 5, 6, and 8-11.

In addition many others have been devised, for example those by Erv Wilson.