Marc. Marcato. In a marked manner, emphasised.
M.M. Maelzel's metronome.
M.M.
Ott., Ova, 8va=Ottava. An octave—as 8va alta=ottava alta, (to be played) an octave higher; 8va bas. = ottava bassa, an octave lower.
p. Piano. Softly.
P.F. or pf. Piano-forte. Soft, then loud.
pp. Pianissimo. Very soft.
ppp. Pianississimo. As softly as possible.