Carmelite Sisters (OCD)

The Discalced Carmelites, or Barefoot Carmelites, is a Catholic mendicant order with roots in the eremitic tradition of the Desert Fathers and Mothers. The order was established in 1593, pursuant to the reform of the Carmelite Order of the Ancient Observance by two Spanish saints, St Teresa of Ávila and St John of the Cross.
St Teresa Avile

The Discalced Carmelite order is now known by the initials "O.C.D." (The older branch of the order, Carmelites of the Ancient Observance, has the initials "O. Carm."). The secular branch of the order (the Secular Order of Discalced Carmelites, formerly known as the Third Order), has the initials "O.C.D.S."