The Peace be upon him reference article from the English Wikipedia on 24-Apr-2004
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Peace be upon him

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Peace Be Upon Him – in Arabic: صلى الله عليه وسلم; salla Allahu alayhi wa sallam, also transliterated as ''sallalahu aleyhi wasallam – is a phrase that Muslims often say after mentioning a prophet. An alternative translation is "May God bless him and grant him peace".

It is seen as a mark of respect and is related to the Islamic concept of dhikr or remembrance. In writing it is generally abbreviated as PBUH or SAW.