Answer:
The Ctrl key.
Step-by-step explanation:
An infinite loop, sometimes called an endless loop, occurs when a program or a portion of a program is running endlessly because no termination condition has been met or set. This may sometimes cause the system to freeze. To manually break out of this loop, a key combination of CTRL and C (CTRL + C) or Break will forcefully end the loop.
Don't forget that a loop is portion of a program that executes repeatedly until a certain condition has been met. So, ordinarily a loop is supposed to end. When it doesn't, then it is infinite.