“A sacrament is a way in which God imparts grace to His people. Orthodox Christians frequently speak of seven sacraments, but God’s gift of Grace is not limited only to those seven- the entire life of the Church is mystical and sacramental. The sacraments were instituted by Christ Jesus Himself (Jn 1:16,17)."
The Seven Mysteries are:
Quotation from The Orthodox Study Bible, p.1786, St. Athanasius Academy of Orthodox Theology