“LBJ took the IRT down to Main Street USA. When he got there, what did he see? The youth of America on LSD” – Hair (musical) 1967.
“LBJ,” “IRT,” and “LSD” are initialisms. We hear, recognize, and use initialisms daily. Many are familiar: MD, NFL, MTV, ASAP, DOA, CIA…. But EMR is not EMR,