William Sommerwerck wrote in message
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What does the symbol mean with 2 barbs to the bar...?

It's supposed to look something like the letter Z -- hence, a Zener diode.



That is logical and my experience too but not in this case , hence the
query.
One barb represents zeners in the symbol set used on this schematic, so what
does the 2 barb (normally zener) symbol mean here?