Imperial Yellow

#ffb200

An orange that is saturated. It is very light — it works as a page background, not as text.

Hex

#ffb200

RGB

255, 178, 0

OKLCh

81.6% 0.171 77.4°

CIELAB (D50)

78.6, 21.1, 80.9

What is true of this colour, and of no other

26 other named colours sit within ΔE00 2 of it — this part of the space is crowded, and the names here are finer distinctions than most people make.
It sits exactly on the sRGB boundary: at this lightness and hue the gamut has nothing left, and a wider display would show a more colourful version of it.
As text on white it measures APCA Lc 33.2; on black, Lc -69.4. The sign is the polarity, which the WCAG ratio discards.
Built into an eleven-step scale, 10 of the 10 adjacent pairs stay ΔE00 2 apart — see the ramp.
protanopia and deuteranopia and tritanopia shift it by ΔE00 19.6 and 19.7 and 20.6 — no red cone.

Text on this colour

White text

1.81:1 — fails AA

Black text

11.62:1 — passes AA

Black text is the better of the two at11.62:1. That is enough for body text.

As text on white, it needs to change

#9f6d00 is the nearest colour of the same hue that passes AA on white, at 4.50:1. Only the lightness moved, and some saturation was given up to stay inside sRGB.

Try it against your own background

The same colour, with one cone missing

As you see it

#ffb200

protanopia

#bdbd07 · ΔE00 19.6

deuteranopia

#cdcd00 · ΔE00 19.7

tritanopia

#dcdc00 · ΔE00 20.6

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isSaffron Soufflé at ΔE00 0.251: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.

Saffron SouffléΔE00 0.251 · #feb209
FrenzyΔE00 0.275 · #feb101
Saffron ThreadΔE00 0.326 · #ffb301
UCLA GoldΔE00 0.341 · #ffb300
Yellow ExhilarationΔE00 0.375 · #ffb102
Dithered AmberΔE00 0.437 · #feb308
Kernel of TruthΔE00 0.461 · #ffb210
Yellow OrangeΔE00 0.599 · #fcb001
Lemon WhisperΔE00 0.625 · #ffb10d
Queen AnneΔE00 0.91 · #fab001
Golden TreasureΔE00 1.05 · #ffb118
Lemon ChromeΔE00 1.109 · #faae00

12 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.