μ is avoided in medicine for being difficult to represent in writing and in computer systems. It's also a source of confusion and error. https://www.ismp.org/r

μ is avoided in medicine for being difficult to represent in writing and in computer systems. It's also a source of confusion and error. https://www.ismp.org/recommendations/error-prone-abbreviations-list https://www.ismp.org/recommendations/error-prone-abbreviatio... > Error-Prone Abbreviations, Symbols, and Dose Designations: > µg > Intended Meaning: Microgram Misinterpretation: Mistaken as mg Best Practice: Use mcg