Rf and Reticular formation

Rf noun - A radioactive transuranic element which has been synthesized.

Reticular formation and Rf are semantically related. In some cases you can use "Reticular formation" instead a noun "Rf".

Reticular formation noun - A complex neural network in the central core of the brainstem; monitors the state of the body and functions in such processes as arousal and sleep and attention and muscle tone.

Rf and reticular formation are semantically related. You can use "Rf" instead a noun phrase "Reticular formation".