Gallery post format not supported?

So just a quick question. The gallery post format isn’t showing up on the Format menu by the right of my post editor. Is it because of a glitch in my WP install/laptop (I wouldn’t put it past my laptop, tbh; this hunk of junk has been giving me grief the past year), or is the gallery post just not supported? I can add galleries just fine, not a big deal, but it’s sort of slightly bothering me, not being able to properly “categorize” the format type.

Yes, I’m slightly OCD like that.