We just talked about millions of hues; the consensus is much more limited though.
The rainbow is typically the symbol of that common sensitivity: 7 colors, nothing else!
Again we meet primaries and secondaries, except magenta, plus violet (not purple!) and orange.
Newton proposed this palette, referring to the 7 notes of the scale
But the discrimination of Indigo is not obvious enough; moreover there is, of course, no border but gradients between the symbolically chosen colors.
From mythological or heraldry symbolism to our technical signaling
the value of colors changed a lot, palettes were narrow or stretched
and every civilization had its own codes.