The Five Points of Calvinism

Basically, Calvinism is known by an acronyn: T.U.L.I.P.

Total Depravity (also known as Total Inability and Original Sin)
Unconditional Election
Limited Atonement (also known as Particular Atonement)
Irresistible Grace
Perseverance of the Saints (also known as Once Saved Always Saved)