Number Seven, also known as "Daniel", is a previously-undisclosed model whose existence is revealed by Number One and members of the Final Five who have recovered their memories (TRS: "No Exit"). This model is believed to be defunct due to a sabotage by Number One prior to the Second Cylon War. The Daniel model was artistic and sensitive, and had a close relationship with Ellen Tigh, which led to murderous fraternal jealousy on the part of the Cavil model. Nothing is known about this model's appearance.
It is possible that Number Seven was named after Daniel Graystone, the inventor of the Twelve Colonies' Centurions.[12].