[ARandomerDude]

And “OK” instead of “I understand, thank you.”

[MonkeyClub]

Still, “k” is infinitely better than a thumbs up.

[ovao]

Hmm, how so? A thumbs up is more bytes, and thus more poignant.

[divan]

No, I'm talking specifically about case of reducing two letters to one.

[fareesh]

OK is oll korrect