Relay computers - OR functionality - symbology

[Dwight K. Elvey]

>From: "Patrick/VCM SysOp" <patrick at vintagecomputermarketplace.com>
>
>> Why didn't they use * or X for AND then?
>
>The period is a convenient substitution for a dot that was used in math to
>indicate multiplication (the "real" symbol is usually represented as more
>vertically centered within the character cell).  I have some books that also
>use "x", but that character is again a more (or sometimes less) stylized
>glyph than the simple upper- or lowercase "X".
>
>By the way, that plus (or) symbol in those same books is often a plus inside
>a circle.  So I suspect the use of plain-old-plus is again a convenient
>substitution into ASCII.
>
>Patrick

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