white space n. an under-served business market or undeveloped product category. (source: Double-Tongued Dictionary)
Further reading
Eels, orts, and Wordle! Sweden awarded its most prestigious literary award to a book about…eels. The Book of Eels reveals the mysterious life cycle of this sea creature and its significance for famous figures from Aristotle to Sigmund Freud. Plus...
A documentary film called My Beautiful Stutter follows youngsters at a summer camp specifically for stutterers. It’s a place for finding acceptance, support, and confidence for navigating the larger world. And:, “The High Priestess of...
Doesn’t “white space” derive from 18/19C Euro-American maps of the world, white being the designation for uncolonized/uncivilized? See for example the beginning of Conrad’s Heart of Darkness where Marlowe remembers being a young adventurous boy looking at a map in which parts of Africa appear “a blank space of delightful mystery—a white patch for a boy to dream gloriously over.”
I don’t know about “derive” since “white space” or “blank space” in a non-jargon sense is a common enough term. I don’t think either can be said to be a term of art for cartography. Here, though, I think we are dealing with a very specific piece of jargon which is well beyond, say, “white space” as an artist’s tool, and is clearly and specifically a term of art.