There is no literal meaning. There isn't someone who runs down a street with a butterfly net snatching up the letter Z and all of his Z pals. Catching some Z's means to get some sleep. It is an idiom. It has no literal meaning.
Probably one of 2 theories: From the illustration of cartoons, where a sleeping person is shown with "zzzzzz" above their head. or "Logging Zs" was an older phrase, from "sawing logs" or snoring. It may have been updated to "catching Zs" since then.
zigzag
ZS Associates was created in 1983.
MG ZS was created in 2001.
there is no animal with double Zs.
zs
ZS Associates is a consulting firm that does not have a traditional "population" like a city or country. They have employees and clients but do not have a population in the traditional sense.
The MG ZS is a family sports car, and was created from BMW's Rover 45, which MG purchased the rights to. The first MG ZS was produced and launched in 2001, the last in 2005.
The following word contains more than 2 zs :- 'Zigzag'
Blizzard
Yes the Sony ZS-H10CP is rugged enough for a construction site, it is also water resistant.
It is out. ZS