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Rn,

symbol for the element radonradon
, gaseous radioactive chemical element; symbol Rn; at. no. 86; mass no. of most stable isotope 222; m.p. about −71°C;; b.p. −61.8°C;; density 9.73 grams per liter at STP; valence usually 0. Radon is colorless and the most dense gas known.
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Rn

(chemistry)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

rn

(ReadNews) A newsreader for Usenet newsgroups. An enhanced version of rn that includes threads is trn. See Usenet.
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References in periodicals archive ?
R.N. was rushed to hospital for treatment and his injuries took two weeks to heal.
Care is always taken to assure that Nurse Externs DO NOT perform any procedures or activities that are not included in the Program Guidelines, and that Nurse Externs always work under the supervision of an R.N. Preceptor.
* Lex Frieden, M.A.; John Hudson, M.S.W.; and Cynthia Zejdlik, R.N., discussing "Is There Life After Rehabilitation?"