Phono plug
Also known as RCA plug. Used for audio, digital signals ( S/PDIF only) and video. Mono only.
Phono plugs are relatively inexpensive (unless gold plated)
and make a good contact. They are not as sturdy as
phone plugs
or
xlr plugs
for repeated use applications (patch bays, portable equipment).
They also are not recommended for situations where the signal (tip)
should never touch the ground (sleeve).