D defs.my
Entry 1 sense Webster, 1913

SOS

· IPA /ˌɛs.oʊˈɛs/
01 The letters signified by the signal (···———···) prescribed by the International Radiotelegraphic Convention of 1912 for use by ships in distress.
  1. 1.
    The letters signified by the signal (···———···) prescribed by the International Radiotelegraphic Convention of 1912 for use by ships in distress.