🚀 go-pugleaf

APL's supplied by DEC (APLSF and VAX-11 APL) use "TTY mnemonics" which
I found easy to remember.  They are either derived from the function, as
in .TR for transpose, or from the single-strike character, as in .RO (rho)
for reshape (not .rh!) and .IO (iota) for index (not .it!).

One advantage of this approach is that the three character mnemonic is
interpreted as the single APL character, which allows it to be used inside
quoted literals, etc.  This is very useful in an environment where some
but not all of your terminals support APL characters.

eric golin