What is PROD?

So, I’ve been wondering lately, what constitutes a “PROD” system? Is it the ethernet network that it plugs into? Is it the SLA to which a system is supported? Is it the rating/SLA of the application that is running on the system?

I have an example to present to you:
The syslog infrastructure is a PROD application. For various design purposes a syslog relay is being placed in each network segment of each datacenter. Even though one of these relay servers is physically in a datacenter #4 DEV cabinet on the DEV network, it is still considered a PROD application. So does this mean a change request is needed to load the OS or modify settings on this system? If not, then how is change control/auditing maintained from an application perspective?