RRT

1.
rail rapid transit.
1.
registered respiratory therapist.
RRT
Registered Respiratory Therapist

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R.R.T.
1. registered respiratory therapist.
Rs
noun, plural R’s or Rs, r’s or rs. 1. the 18th letter of the English alphabet, a consonant. 2. any spoken sound represented by the letter R or r, as in ran, carrot, or rhyme. 3. something having the shape of R . 4. a written or printed representation of the letter R or r. […]
R.s.
1. right side. 1. Recording Secretary. 2. Reformed Spelling. 3. Revised Statutes. 4. Royal Society. R.S. Revised Statutes