[Aachen]

In that link:

> The Earth's rotational kinetic energy is about 10²9 J, and the world uses something like 10²² J/year, so you could power the entire world for millions of years before you'd run out of rotational energy.

(my phone somehow has a ² but not a ^9; the first number is supposed to be 1e29)

[schoen]

Here are some Unicode exponents for your future needs: ⁰¹²³⁴⁵⁶⁷⁸⁹

[timbit42]

What about dozenal?

[schoen]

It's really not very common in typical online writing about science and engineering, but I'm happy to share ᴬᴮᵃᵇ and ₁₂ in case they're also useful to anybody.