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Wiktionary
battleship grey

a. Of a medium grey colour tinged with blue, like that of a battleship. alt. A medium grey colour tinged with blue, like that of a battleship. n. A medium grey colour tinged with blue, like that of a battleship.

Wikipedia
Battleship Grey

"Battleship Grey" is a song by Tiƫsto with Kirsty Hawkshaw providing vocals. It appeared on his first album, In My Memory. It was also included on Hawkshaw's album, Meta Message. Miro or Miromusic created a chillout remix which received great acclaim, and led to the release of the single. Only 300 copies were released through Nebula Records, and 100 in other labels.