This can opener is referred to as a church key.
Slang a device for opening cans, esp. originally beer cans, by punching a -shaped hole in the top
A can or bottle opener having a usually triangular head.
Origin of church keyFrom the resemblance of the cap-gripping end of some bottle openers to the ornamental handles of large keys, such as those used to lock church doors.
(plural church keys)
- A can opener having a triangular tip that pierces the can.