What is a mono phone cable?

Usually when people talk about a phone cable or a phono cable they mean a 1/4" cable. Mono mean that it only caries one signal with it (a hot signal and a ground, Or + and - ). Thus it has two pins on it. A stereo cable would have three pins so it could have two separate sounds (one for each ear). They call them phone cables or phono cables because i believe they used to use them in the old phone switchboards in the past.

So get a 1/4" male mono cable.