planck's constant

It relates to the energy in one quantum of electromagnetic radiation to the frequency of that radiation.
It is 6.62607004 × 10-34 m2 kg / s

Dustin : do you know planck's constant ?
Suzie: do you know the earth orbits the sun?
Dustin: So I know it starts with two sixes and then uh what is it...?
Suzie: okay let me just be clear on this. I havent heard from you in a while and now you want a mathematical equation that you should know so you can... save the world?
Dustin: Suzie-poo I promise I will make it up to you as soon as possible.
Suzie: you could make it up to me now
Dustin:what?
Suzie: I want to hear it
Dustin : not right now!
Suzie: yes now Dusti-bun!
Dustin: Suzie-poo this is urgent!!
Suzie: yes yes youre saving the world I heard you the first time but dennis is also saving earth sea and he is about to confront the shadow so this is suzie signing off.
Dustin: wait wait wait okay okay. ..okay
Dustin: aaa shit...

(starts singing never ending story)

Suzie: Planck's constant is 6.62607004

Planck constant

a fundamental constant, equal to the energy of a quantum of electromagnetic radiation divided by its frequency, with a value of 6.626 × 10⁻³⁴ joule-seconds.

The Planck constant is denoted by a capital H (ℎ).