Greeting on the Prophet (peace be upon him) and his Ahl al-Bayt ( peace be upon them).
Useful information: It is recommended that whenever a person hears or utters the sacred name of the holy Prophet of Islam (for example Muhammad or Ahmad), or his title (for example, Mustafa) or his patronymic (for example, Abul Qasim) he should say. "Alahumma salli 'ala Muhommadin wa Ale Muhammad" even though he may be offering prayers at that time.
It is recommended that while writing the sacred name of the holy Prophet greeting be written for him. And it is also preferable that whenever his name is mentioned greeting be sent on him.