c q d

1 definition found

c q d - Collaborative International Dictionary of English v.0.48 :

  C Q D \C Q D\
     In radiotelegraphy, the letters signified by the code call
     formerly used (cf. S O S) by ships in distress, formed by
     combining the code call C Q (formerly used as a general call
     for all stations) with D for distress.
     [Webster 1913 Suppl.]