Roll Under d20

You are trying to roll a dice under the number for the stat you have or the target number

Dragonbane The Black Hack Crown & Skull Cosmere RPG
Roll Over d20

You are trying to roll a dice and roll equal to or over a target number

Vagabond Shadowdark Distal Brimstone
D6 Pool

You are rolling #d6 and based on the number # of successes you determine what happens.

Mistborn
Single D6

You utilize a single d6 to handle all of your outcomes.

ICONS
Power Roll (2d10)

Rolling 2d10 and then checking for different tiers of success based on numbers

Draw Steel