D4 or D-4 can mean:
*D4 video connector *A polyhedral dice commonly referred to as a d4, see 4-sided die *A Dublin postcode see Dublin 4 *D4 framing standard *The D4, a rock band
*A square on a chess board, as well as a move or even opening pertaining to that square. *Driver: Parallel Lines, the fourth videogame in the Driver series *Alidaunia IATA code *A very annoying posh person from Dublin 4 who wears dubes, and is often seen saying such words as 'roysh', 'rooogby' and 'omigod!'
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