Reverse polarity SMA (RP) is a connector keying system that reverses the gender (interface) of SMA connector(s). This can cause confusion since the term plug becomes un-associated with male and the term jack becomes un-associated with female.
A RP-SMA plug utilises the same external housing as a standard SMA plug. The internal pin is replaced by a receptacle.
SMA RP plugs do not mate with standard SMA jacks.