Peace be upon him is a phrase that practising Muslims often say after saying (or hearing) the name of a prophet of Islam. There are three variants of this phrase in Arabic:

• "Peace be upon him": (Arabic: عليه السلام‎ ʿAlayhis salaam - A.S.) - this expression follows after naming any prophet other than Muhammad, or one of the archangels (i.e. Jibreel, Mikaeel, etc.)
• "May Allah honour him and grant him peace.": (Arabic: صلى الله عليه وسلم‎ ṣall Allahu ʿalayhi wa sallam - S.A.W., SAAW, or SAAS) - this expression follows specifically after saying the name of the last prophet of Islam, Muhammad.
• "May Allah grant peace and blessings to him and his family.": (Arabic: صلى الله عليه و اله‎ ṣall Allahu ʿalayhi wa aalih - S.A.W.W.) - this expression follows specifically after saying the name of the last prophet of Islam, Muhammad.

In Arabic these salutations are called ṣalawāt, and are abbreviated by some with the use of SAW (in accordance with the Arabic words sallallahou alayhi wasallam) or PBUH (which stands for Peace be upon him in English). However, this practice is considered to be controversial among senior Islamic scholars who disagree with this use on the basis that it

ṣallā llahu ʿalayhi wa sallam, written in Arabic Calligraphy