Small components most often used for buffering and/or fastening between surfaces.
Board Spacers, Standoffs
Devices that are designed to create space between two boards at a specific height. These devices must be connected to the board with an external accessory (like a screw).
Board Supports
Devices that are designed to create space between two boards at a specific height. These devices have mechanisms built into the part to attach the device to the boards.
Channel, DIN Rail
A plastic or metal bar that conforms to one of a set of standard widths and designs. Used to mount industrial control equipment, connectors, power supplies, etc., within a boxes and racks.
Rivets
Short metal pins. One end usually has a head. The headless end is inserted between two surfaces and then molded into a head shape by the use of some tool.