D is the fourth letter of the modern English alphabet and the ISO basic Latin alphabet.The Semitic letter Dāleth may have developed from the logogram for a fish or a door. The sound consistently represented by the letter in Semitic, Greek, Latin and the modern languages of Europe is the voiced dental stop. In English this sound, as well as the unvoiced sound represented by t, has become alveolar, that is to say, is pronounced by the pressure of the tongue upon the gums rather than upon the teeth

  • in physics D is density or relative density
  • in mathematics  D is the differential operator in calculus and analysis
  • in traditional use D is day
  • in music D is the second tone in the scale of C major or the fourth tone in the relative minor scale
  • in aeronautics  D is aeronautics drag
  • in switzerland D is davos
  • in idiolect D is doppler

wikipedia, Encyclopædia Britannica, www.cavitas-aris.com

literki – www.cavitas-aris.com