XLR connector
The XLR connector is a circular connector with between 3 and 7 pins, often found on professional audio, video, and stage lighting equipment. The international standard for XLR is IEC 61076-2-103.
XLR connectors are often used for symmetrical input connections.
Used in
Pictures
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XLR cable connectors (3 pin)
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XLR panel socket (5 pin)