Here's another list of nonsense words from my postgraduate days, as dictated by J.D. O'Connor. It shows various extemporized symbols for sound types for which the (then) IPA made no provision.
As my marginal notes indicate, in line 3 z* was to stand for z with no friction, i.e. for an alveolar grooved approximant. In the same word the linked pk obviously stands for a labial-velar plosive, which is more usually (though arguably less logically) written k͡p.
In line 4 fɾʼ stands for an ejective cluster (as in yesterday’s nonsense). The symbol ʇ with an inferior right-to-left arrow, as the marginal note says, stands for a “reverse click”, i.e. a dental stop sound made with an egressive velaric airstream — a sound type not attested in human languages as far as I know.
Lower down, the improvised p with a superior left-to-right arrow is glossed “kiss click”. Now the IPA has a recognized symbol for this sound, the voiceless bilabial click, namely ʘ. In the same word we have an alveolar-labiodental ejective fricative, written as sf with an inferior tie bar.
In the last line but one the last symbol is a bit of a mystery. The underlined s with a superior right-to-left arrow is glossed “= [ks]” (with an inferior tie bar). I’m not sure what that means, nor how the sound shown by this symbol would have been different from the one shown by the same symbol without the underlining.
What fun we used to have!