Let’s assume what you mean is how to identify individual cables when there are several. You should do this at both ends.
There are cable assemblies, such as the old component AV cables used before HDMI, where color codes were used.
When reconfiguring my home AV set-up, I tend to print up labels using a hand-held label making tool, which produces as strip of adhesive backed tape. These will not stick on a rounded cable by themselves (or not for long) but I cover them with clear packing tape.
Back in the late 1970’s I was the studio engineer for a small radio station and was tasked with setting up a totally new studio for the FM side (prior to this the FM sent out the same programming as the AM side during daylight hours, and when the AM went dark we just used that studio.
I was actually using balanced lines, which are not really coaxial, but were two conductors wrapped with a shield and covered in plastic insulation, so pretty similar. Each cable terminated to screw terminals, so I did not have to put connectors on the end. I ordered some clear heat-shrink tubing, and typed up labels onto a sheet of paper, and cut out each label, slid the clear tubing over it, and shrunk it tightly around the label. If the set-up had required connectors, this could have been done prior to putting them on. But you won’t be able to get a heat-shrink tube that will be large enough to go on over a coax connector and still shrink enough to hold a label tightly. (With typical cables, anyway. Some ham radio cables I have used have a diameter pretty close to that of the connector).
That radio station had been first set up in 1947. The lines had been labeled, but actually with old-style store merchandize tags, little circles of paper with a metal edge around the rim, tied onto the wires with strings! And whatever had been hand-written on with a fountain pen or pencil had faded, as the paper darkened with age, so they were pretty much illegible.
I would like to think that my labelling system would still be useable today, but the station was abandoned less than 20 years later.
When running temporary stage set-ups for sound reinforcement, such dedicated labelling is not needed, but you still need to be able to trace cables from, say, one end of a microphone cable to another. I just put colored tape wraps, the same on each end. No real system to it, but it can save time compared to following one black wire out of many. Since I might only have five colors of tape, I would add multiple winds. One green, two greens, three greens, one red…
