What is rn?

It seems like you're asking for information about "rn," but the term is a bit ambiguous. "RN" can refer to several things, depending on the context:

1. Registered Nurse (RN): This is a healthcare professional who has completed the necessary education and training and has been licensed to practice nursing. RNs provide a wide range of patient care and can work in various settings, including hospitals, clinics, and community health organizations.

2. Right Now (RN): In internet slang and texting, "RN" is often used as an abbreviation for "right now," indicating immediacy or the present moment.

3. Radon (Rn): In the field of chemistry, "Rn" is the symbol for radon, which is a chemical element. Radon is a radioactive noble gas that is a health hazard due to its radioactive properties and can accumulate in homes, especially in basements and lower floors.

If you can provide more context or specify which "rn" you are referring to, I can offer more detailed information.