[aaronblohowiak]

ed gave rise to sed and vi. ed -> em -> ex (VIsual mode). vim is Vi iMproved.

x->y suggests lambda to many people in our community.

Edit: I meant to provide some additional information to other readers, not to disagree in any way.

[silentbicycle]

Well, right, but how many people here have actually used ed standalone? (lone hand) It's overwhelmingly likely that most people picked it up from vi(m).