I was chatting with one of the nurses the other day and we got to talking about medical abbreviations. Medical terminology is crazy enough, but then we have to throw in things like: BOM, BRBPR, SOB, PFO, COPD, NAD, VSS, N/V/D, QD, QOD, QHS, QAC, BID, QID, PO, NPO, OU, D/C, Rx, Sx, Dx, C/O, CC, R/O, CXR, PA, CAD, PVD, PUD, PID, BM, LGSIL, PE, PCOS, HTN, DM, PERRLA, MI, CVA, TIA, SVT, AFIB, DVT, Hx, PROM, DCIS, AVM, B/L, BS, DNR, LVH, MS, MVP, UTI and VUR. Those are just a few, and of course some of them have multiple meanings.
My favorite ones are the ones with a line over the top. I still use a, p, d, s, and c with a line over them (ā).