How many mills in a nip?

The term "nip" typically refers to the distance between two rolls in a mill, often in the context of a rolling mill. The number of mills in a nip can vary depending on the specific setup and design of the mill. Generally, a nip involves two rolls, but in some contexts, multiple nips may be involved in a series of mills. Therefore, the number of mills in a nip can vary, but it commonly refers to a pair of rolls working together.