In electronics, a
phone connector, also known as
phone jack,
audio jack or
jack plug, is a common family of connector typically used for
analog signals, primarily
audio. It is cylindrical in shape, typically with two, three or four contacts. Three-contact versions are known as
TRS connectors, where
T stands for "tip",
R stands for "ring" and
S stands for "sleeve". Similarly, two- and four-contact versions are called
TS and
TRRS connectors respectively.