Not sure. Ultility companies often have their own terms. My brother worked for over 40 years at PECO where back in the 1970's one of the older lineman collected 15 amp 120 volt meters that were used in South Philly around 1910. The glass enclosing the meter had two wing nuts to install meter seal and what I would call a terminal box for connecting the service & load wires. Any way my brother purchased one of these meters that was made into a desk lamp with a nice brass nameplate with my name on it. Only used it for a short time because I did not trust the very old wires. Was thinking of connecting it thru an 25 VA isolation transformer then thru a AFCI / GFCI circuit breaker & a non time delay 0.2 amp fuse to illuminate an LED lamp. Of course being a life long Ultility non NEC code linesmen amp only ran two wire zip cord to feed the old meter metal box . ( no ground ).