Here is a set of one-letter sigla for any sizes of recorder used in our scores, sorted from the highest to the lowest. The notes are the real ones, even if often their notation is an octave above.

Sigla	Names	Lowest Notes
N	Sopranino
D	Sixth Flute / Soprano in D
S	Soprano / Descant in C
C	Generic recorder in C This siglum is useful to indicate the upper part(s) of a sonata, or other composition, that could be played either on a descant or on a tenor recorder.
H	Fourth Flute / Recorder in Bb
G	Treble Recorder in G
A	Alto / Treble in F
V	Voice Flute / Tenor in D
T	Tenor
B	Bass in F
L	Bass in C
F	Great Bass in F