Scientific notation for the speed of light (3*10^8 m/s รขยย 299 792 458m/s) but also the Hexidecimal value of 1000 as:
3*16^2 + 14*16^1 + 8*16^0 = 1000
3 E 8
A sweet coincidence and a lazy-neat way of memorizing the speed of light.
some scientific calculators have a convert to hex and covert to decimal button. If your ever boned and having a physics test, I hope this saves you. hex(1000) = 3E8!
13๐ 1๐