A "BNC M to 2 BNC F (T)" refers to a type of coaxial cable adapter or splitter. Here's a breakdown of the terms:

• BNC M: This stands for a BNC male connector, which is a round, metal connector with a pin in the center that plugs into a matching BNC female socket. "M" denotes male, indicating it has a pin.

• 2 BNC F: This means two BNC female connectors. These are the opposite of BNC male connectors, having a hole to receive the male pin. The "F" stands for female.

• (T): The "T" typically refers to a T-shaped splitter or adapter, which takes one input (a BNC male) and splits it into two outputs (two BNC females). This allows the signal from the male end to be distributed to two separate female connections.