MS2, etc, if pattern spans measures or variations BSD: back surdo (L for low, H for high)
R/L
Accented note (right/left hand suggested)
r/l
Quieter, unaccented note
*
A trill, generally three very fast notes on repique/caixa, two or three for surdos Common break specific to Samba Reggae 2 and 3 https://www.youtube.com/watch?v=xSXH0wFprbY is similar to JEDEC MO-293B Var UAAD-1, https://www.ti.com/lit/ml/mpds158d/mpds158d.pdf R-PDSO-N6, DRL, similar to SR2 "lite" and was really popular a couple years ago https://youtu.be/v9A9n-kMjz0?t=291 Ile Aye de Miranda has two versions: https://www.youtube.com/watch?v=IPLT2B8EH0A and https://www.youtube.com/watch?v=J04yoOoGRNk the second one.