"Green rectangular key with 3 pins on one end and CISCO, CAS, and a ‘0’ printed on it."
A: "This is a cable access system pad. It’s used in the silver / green cable distribution amplifiers (nodes) to modulate the signal out. The 0 indicates it removed no signal and allowed full power out down the run."
Surely not as confused as the person who wrote it…
I think the stem is hollow, which would make it a really fancy Klein bottle. Can't tell, though, so you may be right.