Relay computers - OR functionality - symbology

[Patrick]

> Hi
>  Most times, a plus in a circle is to indicate an exclusive-or.
> Dwight

Oops! That's right. And just to add more wonder, another book I was looking
at uses a "V" looking symbol and an inverted "V".  These are also defined as
"∨" and "∧" in HTML 4.0, although my browser doesn't seem to display
them.  Does their adoption as standard entities mean these are "standard"
international symbols?  --Patrick