Tin Snips

There are left and right versions. These refers to the direction they turn, not whether you are going from left or right or using your right or left hand.

https://en.wikipedia.org/wiki/Snips#:~:text=Straight%20cutting%20snips%20(generally%20have,tight%20curve%20to%20the%20right.

There are also upright snips - for cutting where your hands are out of the way of what you are cutting - [1]