Plugboard: A perforated board into which plugs or pins were placed to control the operation of punch card tabulating equipment. Also known as control panels, plugboards allowed machine operators to 'program' the equipment to perform specific tasks such as addition, subtraction, and multiplication. An example of a plugboard is shown above.
Petaflop: A measure of a computer's processing speed. It can be expressed as a thousand trillion floating point operations per second (FLOPS), or a thousand teraflops, or 10 to the 15th power FLOPS.