That's just two wires twisted together, one carrying a signal and the other carrying the ground for that same signal.
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A trapezoid
it's a something
A line can be leased as either a 2-wire (1-pair) line or a 4-wire (2-pair) line. A 2-pair line uses 1 pair to transmit and 1 pair to receive. With a 1-pair line, you transmit and receive over the same pair of wires.
CAT5 or if nessecary CAT6 Twisted pair...
you suck look in a dicinary