zzzkk.

n.  the sound of mechanical warriors suffering electrical malfunctions, as in the comic book Dirty Pair: Start the Violence by Adam Warren.

zzzkt.

n.  a crackle of electricity, as in the graphic novel Falcon Twin by Brenden Mecleary; see also kzzkt.

zzznrk.

n.  the snort of someone talking in his sleep, as in the comic strip “PvP” by Scott R. Kurtz.

zzzp.

n.  the sound a zipper makes, as in the graphic novel ShadowFall by Kaichi Satake; see also zzzz.

zzzrt krzkk bzzz pzzzt.

n.  “horrid noises” pouring from a re-wired drum machine; “a bizarre series of crackles and static, like an overloaded transformer” (Paul Di Filippo, Neutrino Drag).

zzzrt-zzzzrt-zzzrt-zzzrt.

n.  the “loud, repetitive” call of the Black-Chested Prinia bird, as described in Birds of Southern Africa by Ian Sinclair.

zzzsssh.

n.  the hiss of air blasts from jet-boots, as in the comic book Mister Miracle #17 by Jack Kirby.

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