Things worthy of notice.

(dated, idiomatic, now chiefly India) Absolutely not; definitely no.

(music) The highest and usually climactic note of a song or composition, especially one that is difficult to reach. / (figuratively) A climax or best achievement.

(archaic) One should take immediate advantage of an opportunity that may not be available later.

Probability (as applied in the Copenhagen interpretation) is an unsatisfactory basis for understanding quantum mechanics.

(aviation) Abbreviation of notice to airmen (to inform pilots of hazards).

Alternative form of empty the tank

(obsolete) A violent and peremptory procedure without any assigned reason; a sudden conclusive happening.

(music) a note that has 1/16 the value of a whole note

(music, US) a note with 1/32 the length of a whole note