Fulcrum I think.
If you are talking about a hand held manual can opener then the fulcrum would be the rim of the can against which you engage the little notch before you exert pressure upwards on the handle to open the can.
In a can opener, the resistance force is the force required to open the can, applied by the person using the can opener. The effort force is the force exerted by the person to operate the can opener. The fulcrum is the pivot point around which the can opener rotates to open the can.
A bottle opener is a class 2 lever because the output force is between the fulcrum and the input force. In this case, the fulcrum is at one end, the input force is applied on the other end, and the output force is in the middle.
The fulcrum is the pivot point where the bottle opener rotates, typically located near the base of the bottle opener. The effort is applied by the user at the handle end of the bottle opener to lift the bottle cap. The load is the resistance provided by the bottle cap, which is located at the other end of the bottle opener.
A tin can opener.
A paint opener is a class 3 lever because the effort is applied between the load and the fulcrum.
The can opener.
For opening tins
The fulcrum on a can opener is where the hook meets the lip of the can. The can opener is a class 1 lever.
because the load is situated between the effort and fulcrum
A tin-opener.