A modular terminal block, screw, spring or IDC, (often green in color) by Phoenix Contact, used to carry power/signal/data in permanent installations. Sometimes found on the back of audio amplifiers.
One example:
http://www.phoenixcontact.com/pcb-terminal-block/32098_29769.htm
One example:
http://www.phoenixcontact.com/pcb-terminal-block/32098_29769.htm
