The letters T-U-L-I-P have been used since the early 20th century as a popular mnemonic device for the “five points of Calvinism” or “doctrines of grace” in Reformed theology. Each letter stands for one of these doctrines:

• 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”)