What does Urk stand for?

Urkunde - Document, Deed, Instrument - German (ILCA)

Urkunden des Aegyptischen Altertums - G. Steindorff - Leipzig - A publication (BJA)

Urak Lawoi' - Language code (ETLW)

Urko - NCIC firearms make code (NCIC)

You Rock - Chat lingo (CHAT)