Joe, it is the Mercury dimes with the fasces on the reverse side that we called barber pole dimes. The fasces look like a barber pole.
The Mercury is really a winged Liberty which, I guess, only collectors know.

Barber dimes were very scarce (1930s-1940s) so my parents only found a few. We called them Liberty dimes.
Showing my ignorance of Mr. Barber and his design, I capitalized the 'barber' of the barber pole.