Why X, C and V
The keys sit next to each other at the bottom left, where the left hand can reach them while the right hand holds the mouse. X looks like scissors for cutting, C stands for copy and V resembles an insertion mark.
No modes
Tesler fought against “modes” in programs, where the same key does different things depending on the state. He even had a car number plate reading NO MODES. His ideas shaped how programs are controlled today.
Tip
Both Windows and macOS have a clipboard history. On Windows you open it with Win+V.