Eurocard

Eurocard is a European standard format for PCB cards, which can be plugged together into a standardized subrack. The subrack consists of a series of slotted card guides on the top and bottom, into which the cards are slid so they stand on end, like books on a shelf. At the "back" of each card is one or more connectors, which plug into mating connectors on a backplane in the rear of the subrack. The eurocard measures 100mm by 160mm.

The Eurocard standard is also the basis of the Eurorack format for modular synthesizers, popularized by Doepfer and other manufacturers.