What does O.P. at the end of person's name stand for?

Can you tell me the O.P. after a nun’s name means? As in Sr. Mary Margaret O.P. This is my niece’s new name.

Dear Moira,

It stands for “Order of Preachers” which is the official name for the Dominican Order. So your niece is a Dominican. I happen to be a Domincan also.

Fr. Vincent Serpa, O.P.

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