This is certainly used for washing hair without needing a full shower. Bath pillar taps are seperate taps for cold and hot water. All types will also be mounted instantly to the bathtub, within the wall or as freestanding taps on standpipes. The freestanding taps are popular with freestanding baths. https://bathroom-black-taps04825.acidblog.net/64193326/black-mixer-taps-bathroom-an-overview