white space
n.— «“Hamilton and ADL have provided extra competition, while Snergy has gone for niche markets,” he said. DEC’s green and white space policy meant that Rapid had to move into a different market area. “We were strong in green space,” Dunne explained, “so we had to cut a market in white space which has taken us a long time.”» —“Resellers feel pinch as DEC tightens belt” Computing (U.K.) July 27, 1989. (source: Double-Tongued Dictionary)
Further reading
What if, instead of being an inanimate object, a dictionary were alive? That’s the idea behind a lavishly illustrated new children’s book called The Dictionary Story (Bookshop|Amazon) by Oliver Jeffers and Sam Winston. This is part of a...