You roll a d20 and then add an attribute and your proficiency modifier. Then you compare the result to the difficulty number.
What is the D20 system?
Fate Point
What is Fate?
AC
What is Armor Class?
In Dungeons and Dragons, this title gives the impression the GM will only be controlling one location in the game. At least its a location that gets top billing.
What is a Dungeon Master?
In some games, when you roll the highest result of a die, you get to roll that die to add to the result.
What is Explode?
You form a die pool of d10s by adding your dots in an attribute and a skill together, any die roll of eight or better is a success. Remember, tens explode.
What is the Storyteller system?
Willpower Point
What is World/Chronicles of Darkness?
They weave tales in the World of Darkness.
What is a Storyteller?
You roll 2d6s and add your stat. Six and below are a failure, seven through nine are a partial success and 10+ is a full success. That's how you resolve you're Moves.
What is Powered by the Apocalypse?
Inspiration
What is DnD
Daily Double!
What is To Hit Armor Class 0?
Often embodied as the player's boss, they pit the agents of Delta Green against the Mythos.
What is the Handler?
What is a Minmaxer/Munchkin?
You roll a red d10 and a black d10, you add your skill and any resources spent to the black die's result, then you compare your profit against the red die's loss to see if you came out ahead.
What is the Profit system?
Strings
What is Monsterhearts/Masks/Thirsty Sword Lesbians?
HASE
What is Hull, Agility, Systems, Engineering
This particularly odd name comes from Call of Cthulhu.
What is the Keeper?
This is when the GM limits player agency, when its done badly anyway.
What is Rail Roading?
You decide how many points you want to spend from your general ability pool and add that to the roll of a single d6.
What is the Gumshoe system?
Moxie
What is Eclipse Phase?
BECMI
What is Beginner, Expert, Companion, Master, Immortal?
Before DnD there was Chainmail, and all GMs descend from this title.
What is the Referee?
The sensation of embodying your character. When you feel what your character is feeling, for better or for ill.
What is Bleed?