The phrase "written notation" refers to a system or method of recording information or ideas through writing. It involves using letters, symbols, or characters in a structured way to convey meaning to others. Full definition
(c) If the medical evaluation reveals clinical evidence of drug use, as the MRO, you must report the result to the employer as a cancelled test with written notations regarding results of both the evaluation conducted under § 40.193 (d) and any further medical examination. (transportation.gov)
(d) If the medical evaluation reveals no clinical evidence of drug use, as the MRO, you must report this to the employer as a negative test result with written notations regarding the medical examination. (transportation.gov)
The term usually refers to the creation of musical works expressed in written notation. (albertzbenda.com)