Sallalahu Alayhi wa alihi wa Salaam

May Allah's greetings and blessings be upon him and his progeny (used immediately after referring to the Prophet Muhammad (S))

Alayha al-Salaam (a.s.) - Peace be upon her

(used immediately after referring to Khadijah, Fatimah, Zaynab and Maryam)

Alayhi al-Salaam (a.s.) - May Allah bless him

(used immediately after referring to a single Imam or Prophet)

Alayhima al-Salaam (a.s.) - May Allah bless them

(used immediately after referring to two Imams or two Prophets)

Alayhum al-Salaam (a.s.) - May Allah bless them

(used immediately after referring to three or more Imams or Prophets)

Rahimahu Allah - May Allah grant him mercy

(used immediately after referring to a single deceased and respected person)

Rahimahum Allah - May Allah grant them mercy

(used immediately after referring to deceased and respected people)

Quddisa Sirroh - May his soul be blessed

(used immediately after referring to a single deceased and respected scholar)

Quddisa Sirrohuma - May their souls be blessed

(used immediately after referring to deceased and respected scholars)

Radi Allahu anhu - May Allah be pleased with him

(used after referring to a respected companion of the Prophet or the Imams)