The Macintosh Keyboard, Model M0110, was included with the original Macintosh. This keyboard was also shipped with the Macintosh 512K.
This keyboard may be the simplest of all Apple keyboards because it lacks arrow keys and a numeric keypad. It used a telephone-style connector (RJ-10) to connect to the Macintosh, but the cable was wired differently than a standard telephone cord (a telephone cord is not interchangeable and will result in device damage).
This keyboard also introduced the “Command” key and symbol to the world. Apple II computers were in wide use at the time and included the “open Apple” key (a key with the outline of the Apple logo) and a “closed Apple” key (a key with a solid Apple logo), both used for shortcut and other functions before the Macintosh. (The Open- and Closed-Apple keys were also used on the Apple Lisa.) The “Command” key and symbol were used on this original Macintosh Keyboard and functioned similarly to the “Open Apple” key on the IIe. The keyboard that replaced this original Macintosh Keyboard design, the Apple Desktop Bus Keyboard, continued the tradition of the “Open-Apple” symbol by printing the Open-Apple on the same key as the Command symbol.
For years, users (especially teachers, including me) referred to keyboard shortcuts using the “Open-Apple” terminology, such as “Open-Apple-C” (for Edit > Copy) or “Open-Apple-P” (for File > Print), instead of using the arguably more elegant, and now standard term, “Command.”