[sdiy] center detent pots?

[Alex Dickey]

can somebody let me know what the standard notation that parts companies use
for center detent pots, i.e. the ones with the little notch at 12 o'clock
that you can feel in the travel?  john blacet was kind enough to point me to
some (and dammit i can't even find the email at this second) but i couldn't
tell what about the description indicated they were any different from
regular pots.

thanks,
alex