You're welcome. https://dl.acm.org/doi/pdf/10.1145/1283920.1283935 has some phrases that may be interesting to start with, but note that this was Iverson's Turing Award lecture, and he uses a somewhat-functional definition style that —as far as I know— was a proposal but never shipped by any commercial APL.

Another source of interesting phrases: http://dfns.dyalog.com/sindx.htm (but note that here they're embedded in Dyalog's functional definition style; I don't have any clue if that site supports it even as an option)