An "SMA Male to BNC Female RF Adapter" is a specific type of RF (Radio Frequency) adapter used for connecting a device or cable with an SMA (SubMiniature version A) male connector to a device or cable with a BNC (Bayonet Neill–Concelman) female connector. Here's what this term means:
"SMA Male": SMA male connectors have a pin or plug that is meant to be inserted into a female SMA socket.
"BNC Female": BNC female connectors have a socket designed to accept a male BNC pin or plug.
"Adapter": This term signifies that the device is specifically designed to adapt an SMA male connection to a BNC female connection.