The GE Healthcare Model Ms feature some remarkable keycaps, with sharp and well-aligned dye-sub legends that contrast beautifully against other Unicomps of this time period. When connected to a home PC, the keyboard acts as a standard 101-key keyboard with no unique scancodes or macros (at least, as far as I can tell). This leads me to believe any functionality for the keys' legends were purely software side.
The Enhanced Keyboard was the first home consumer, most common and the definitive Model M keyboard, becoming IBM's choice keyboard for a decade after its release and still in production today as the Unicomp Classic. Labelled as being "enhanced" in regards to its layout that became an industry standard and still used today with the addition of GUI keys, the Model M is perhaps the most well-known keyboard of all time thanks to the success of the Enhanced Keyboard and its main host system - the IBM Personal System/2 series. The Enhanced Keyboard was also made available for IBM's earlier "classic" Personal Computer series in both XT and AT flavours, and several other distinct variants exist for other types of systems and custom orders from third-party companies such Dell, Sabre and General Electric.