O.SS.T. or OSST

Latin: (of the) Ordo (or Ordinis) Sanctissimae (or Sanctissimi) Maria Mater Dei

English: Order of the Most Holy Mary Mother of God

O = Ordo in Latin or Order in English

SS = Sanctissimae in Latin or Most Holy in English

T = Theotokos in Greek or God-bearer in English (Note: We prefer to promote devotion to the Blessed Virgin Mary under her special Orthodox Church title, the Theotokos.)

Order of the Most Holy Mary Theotokos

or

Ordo Sanctissimae Theotokos

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"The Old Catholic Marianists" 

Authentic Marianist Monasticism since 2009

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