Thai Signs: Toilets for Monks

I saw this sign at a temple yesterday. There were a row of toilets but on one door there was this sign. It says “hong nam phra ajarn”. Members of the public cannot use it as it is for the monks. “Phra Ajarn” is a teaching monk.

ห้องน้ำ พระอาจารย์ (hong-nam pra-ajaan)