This is a list of set classes by Forte number. For a list of ordered collections, see: list of tone rows and series. Sets are listed next to their complements. Inversions are marked "B" (sets not marked "A" or "B" are symmetrical). "T" and "E" are conventionally used in sets to notate 10 and 11, respectively, as single characters. There are two slightly different methods of obtaining a normal form. This results in two different normal form sets for the same Forte number in a few cases. The alternative notation for those chords are listed in the footnotes.