Turn Off Spell Check in Vim

When I'm writing longer form text in vim, I like to turn on spell check. I don't always want spell check on, so I toggle it on manually when I'm in a Markdown or text file: :set spell.

While I always remember how to toggle it on, I never remember how to toggle it off:

:set nospell

It's the same syntax for any setting - if you wanted to turn off incsearch, its :set noincsearch.