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Wiktionary
dnd

init. Do not disturb

Wikipedia
DND

DND, D&D, or Dnd can refer to:

DND (video game)

DND is one of the earliest role-playing video game. The name dnd is derived from the abbreviation "DND" (D&D) from the original tabletop role-playing game Dungeons & Dragons, which was first released in 1977.

Usage examples of "dnd".

He had behaved very badly, but he had been dnd, too, and he had undoubtedly saved her from njury when the bomb had exploded.