D ( / ˈ d iː /; named dee) is the fourth letter in the basic modern Latin alphabet.

History

The Semitic letter Dâlet probably developed from the logogram for a fish or a door. There are various Egyptian hieroglyphs that might have inspired this. In Semitic, Ancient Greek, and Latin, the letter represented /d/; in the Etruscan alphabet the letter was superfluous but still retained (see letter B). The equivalent Greek letter is Delta, ‹Δ›.

The minuscule (lower-case) form of ‹d› consists of a loop and a tall vertical stroke. It developed by gradual variations on the majuscule (capital) form. In handwriting, it was common to start the arc to the left of the vertical stroke, resulting in a serif at the top of the arc. This serif was extended while the rest of the letter was reduced, resulting in an angled stroke and loop. The angled stroke slowly developed into a vertical stroke.

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• De Boor, Carl-Wilhelm Reinhold, Ph.D.
  pages.cs.wisc.edu
  Professor Emeritus of Computer Sciences and Mathematics at the University of Wisconsin-Madison. His research involves approximation theory. CV, full-text research articles via ftp, links to journals and conferences involving approximation theory.
• Douillet, Pierre L.
  douillet.info
  PhD in Computer Science, Fac. Sc. Paris, France, involved in Operational Research, Computer Science as well as Mathematics. Currently with the ENSAIT (Roubaix, France).
• Draghia, Dumitru, Dr.
  draghia.homestead.com
  Researcher at the National Communications Research Institute, Bucharest. His doctoral research focus was continuity in Banach algebras. His teaching has included real and complex analysis, functional analysis, and measure theory. Brief CV, list of publications, contact information, links to his research and teaching sites.