fa'o FAhO cmavo

unconditional end of text; outside regular grammar; used for computer input.

On affix form:

fanmo
x1 is an end/finish/termination of thing/process x2; [not necessarily implying completeness].

In notes:

zo si si zei fa'o
x1 is a nonsense zei-lujvo using parts x2, silly by standard x3.