For an entire hotel, average daily rate - ADR - is ADR (your total room revenue for the night divided by the number of rooms you rented that night, period, regardless of room type or room inventory). You can't really pro-rate it for two or three-room suites, because you can't rent just one room in a suite and leave the other unoccupied, or rent it to someone else. ("ADKey" is a term so not in use to describe a hotel statistic, that you can't even get any relevant hits if you Google it, which I attempted before I answered your question; but I guess you could refer to it as ADKey if you want, since that's about the size of it.)

ADR works better as a statistic if it is applied to similar room types; the more similar, the better. I could see applying ADR to an entire hotel with a mix of rooms and suites then, in addition, calculating ADR for standard rooms (and within that, ADR for doubles, ADR for kings, etc.), as well as ADR for suites (then within that, ADR for 'shotgun' suites like you'd find in a Comfort Suites or the older Embassy Suites, ADR for studio suites, ADR for one-bedroom suites, ADR for two-bedroom suites, etc.); as useful information.