you would score 300
Assuming the 12 consecutive strikes were in the same game, you'd have a 300.
12-bagger, or 300, or perfect game
It's called a perfect game.
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10 strikes in a row from frames 1 through 10 would be a 260, but you would still get to bowl 2 balls in the tenth frame so the score could be higher.
If all 12 are in a single game, it's called a Perfect Game, or a 300 Game. If they span two games, it is sometimes referred to as an "Andy Varipapa 300 game."