I'm looking for a 4-poles (TRRS) 3.5mm jack socket with integrated switch, and stumbled upon this connector schematic:
(this is an extract from the CLIFF FC68129 datasheet)
I understand that pins 1, 2, 3 and 4 are respectively the sleeve, rings and tip contacts, and pin 6 the tip normally-closed switch.
What about pin 5 and its associated switch on pin 7? The other pins already yield the right amount of connections for a TRRS jack socket.
My guess is that it could be some kind of "fully inserted plug" switch, but I cannot find the topmost "weird lengthy closed triangle" symbol in other datasheets.
This seller has a 360° photo view of the connector, but it does not help me.