I really like the precision of scientific notation - middle C is C4. The tuning note for a euphonium is Bb3 and for Bb trumpet is Bb4. That flashy ending note for "Carnival in Venice" is Eb5 for euphonium and Eb6 for cornet.
I acknowledge that this is not common terminology - high, upper, middle, low, and pedal are more descriptive terms - but they can lead to imprecision. After all, elementary school my top note was high F - F4 - yet by college that was just F, since I could reach D5 (in warmup only!) by then.
Dean L. Surkin
Mack Brass MACK-EU1150S, BB1 mouthpiece
Bach 36B trombone; Bach 6.5AL and Faxx 7C mouthpieces (pBone on loan to granddaughter)
Steinway 1902 Model A, restored by AC Pianocraft in 1988; Kawai MP8, Yamaha KX-76
See my avatar: Jazz (the black cockapoo; RIP) and Delilah (the cavapoo) keep me company while practicing