Vnnn is a particular VIRUS spectrograph, and more specifically, the a spectrograph camera
Example V037 = VIRUS spectrograph ID 037

Snnn is a particular slot in the IHMP into which an IFU is plugged.
What is sometimes called 'IFU 104' for example, is not an IFU, hence the S104 name.

Innnn is a particular IFU.
For example I7001 is the IFU for LRS2-B in IHMP slot S056.

Cnnn and Cnnn-rr is a CCD controller and the rr is the controller revision code.
For example C041-04

Vnnnxx is a data channel of a spectrograph.
For example, V016RU. The data channel source is a CCD amplifier.

Exyz is a VIRUS Enclosure Slot where x = the VIRUS Enclosure Number (1 or 2); y = the VIRUS Enclosure Column Number (1 -5) and z = the VIRUS Enclosure Row Number (1-8).
For example E132 is the slot in VIRUS Enclosure 1, Column 3, Row 2