Yeah. RS-232 and RJ45 come to mind. 1,2,3,6 anyone?
Yes, we do remember that pin numbering. Add in 4-6, 8-20 if you need to creep out RTS/CTS.
RJ45 is a standard. But the term is erroneously used to refer to an 8P8C modular connector.
Somewhere in the FCC regulations is a definition of what exactly an RJ45 is, which is a jack for a leased data line from the telephone company.
At one point you could call the phone company and tell them that you need a leased line with an RJ45 and that told the telephone company everything they needed to know to install a circuit and jack compatible with your equipment.
The “RJ” in RJ45 stands for “Registered Jack” and there is a whole series of them, all not only specifying the connector to be used but the arrangement of circuits and the type of circuits to be used with them.
For example, an RJ21X defines a 50 pin micro-ribbon connector with up to 25 analog (POTS) lines on it.
So, technically speaking and perhaps being a little pedantic, an 8P8C modular connector used with ethernet is NOT an RJ45.