Zs

sleep (often used with grab, catch, etc.):
to grab some z’s before dinner.
the 26th letter of the english alphabet, a consonant.
any spoken sound represented by the letter z or z, as in zero, zigzag, or buzzer.
something having the shape of a z .
a written or printed representation of the letter z or z.
a device, as a printer’s type, for reproducing the letter z or z.
zeptosecond.
historical examples

in the other case (zs) the next note is a third lower: but it does not seem to belong to the circ-mflexed syllable.
the modes of ancient greek music david binning monro

they think if they talk like they had an egg in there mouth an put in lots of zs its french.
“same old bill, eh mable!” edward streeter

zs seem to kinder go with the astrology business, somehow—i dont know why.
short sixes h. c. bunner

curves showing the relation of 1/ρ and zs or μ and b, are called “permeability curves.”
encyclopaedia britannica, 11th edition, volume 9, slice 2 various

zeptosecond
sleep
zeptosecond