[iDon]

The name I recall from using it on a PDP 11/04 was 'Text Editor and Corrector' https://en.wikipedia.org/wiki/TECO_(text_editor)

I vaguely recall it had a line-open / visual mode, like ex/vi, which we didn't use because we were on a dot-matrix line printer / teletype. The ADM-3A had the Ctrl key on the home line; this design made it easy for editors from that period (vi, emacs) to make heavy use of Ctrl.

Thanks to those who posted bits of TECO - I'd forgotten how the character movement was similar to vi. A fellow student in our CS honours year had a semester thesis project analysing the grammar of vi commands and specifying it in a formal grammar. The combination of action x movement is powerful, simple and concise.

[SulphurCrested]

It could also be invoked on VAX/VMS under the name “MUNG”, which was said to stand for “Modify Until No Good”. I think that style of invocation did something slightly different than using the TECO command, like creating a new file.