Navy blue is a colour so dark it can be taken for black. The shade of a sailor's uniform, which is exactly where the name comes from.
The Royal Navy adopted it in the eighteenth century and the world followed. It is the standard colour of school uniforms, business suits and passports, chosen because it reads as serious without the severity of black and hides a great deal of wear. Telling it from black in poor light is genuinely hard, which is the source of a good many morning mistakes.
So called because it was the color of the British naval uniform.
Etymology from Wiktionary, CC BY-SA
Practised in A Man Called Ove
First appears in chapter 2 of A Man Called Ove.
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