dah

Short definition from Wiktionary

Noun

1. 1
   The spoken representation of a dash in radio and telegraph Morse code.
2. 2
   A long knife or sword with a round cross-section grip, a long, gently curving blade with a single edge, and no guard.

Symbol

1. 1
   Symbol for decahenry, an SI unit of electrical inductance equal to 10¹ henrys.