Rnd is likely misspelled.
Rnd has no English definition.
As an initialism dnd is
do not disturb.
As an abbreviation DND is
abbreviation of w:Dungeons & Dragons|Dungeons & Dragons|lang=en.
dnd
English
Initialism
(Initialism)
(head)
Do not disturb
Usage notes
* Used on keypads for telephones and other space-constrained locations and situations
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