Sounds like a typo to me. Maybe a new engineer/draftsman or somebody who doesn't really know what they want and fer sher don't know what to call it.

Time to pull out that pad of RFI's and start writing.

Or I guess you could just show up with a keyless mounted inside an old 3-lb coffee can just to see what kind of reaction you get.

Radar

There are 10 types of people. Those who know binary, and those who don't.