P.B.U.H.
These acronyms refer to the phrase "Peace Be Upon/with Him" which mean in Arabic: "'Alaihis Salam" عليه السلام, an expression articulated when the name of a prophet is mentioned. This expression does not convey the meaning of "Salla Allahu 'Alaihi Wa Alihi wa Sallam" صلى الله عليه وعلى اله و سلم which means: Allah blesses him and his family and sends them His greetings."