C-{Z,X,C,V} の由来についての情報がある。

Well, we did X because it was a cross-out, and we did V because it pointed down like this, and you were inserting, like an upside down caret. [Laughter] That was Paste. And Z was the closest one, because we figured you’d Undo a lot. And C for Copy, that was easy. So that’s how we did that.