@rk I found a "PL/I for people who know Fortran" doc which introduces all the new special characters not in Fortran. I didn't realize PL/I used || for concatenation!
From http://www.bitsavers.org/pdf/ibm/360/pli/SC20-1637-3_A_Guide_to_PL_I_for_FORTRAN_Users_May68.pdf
There's gotta be an IBM keyboard to find that has |, &, and ¬ but lacks ^.
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