It ain't pretty, but I put this one-sheet reference chart together ages ago based on stuff I picked up from workshops with other New York City area players at The Guitar Study Center, run by Happy Traum, a name some might recognize from lesson books published in the 60's & 70's.
I've used it as a core piece in teaching, so that's why it's labeled 'Theory Primer' & 'Lesson 2'.
The 'Hand Signals' at the far right were used in studio settings to silently call out the key of the tune. Key of C is 'home', the signal being thumb & forefinger shaping a 'C', holding fingers down or up for the number of sharps or flats from C to call out another key. (why the illogical up for flats and down for sharps? dunno. never asked. I was dumb enuff and you never questioned older cats) Since most of us couldn't actually sight read 'real' music to save our lives, we'd have a shorthand chart for a tune giving us the I-IV-V's, etc., with slashes indicating beats & measures for each chord, but no key specified.
^^
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