T-slot nut
Encyclopedia
A T-slot nut is used with a threaded clamp to position and secure pieces being worked on in a woodshop. The T-slot nut slides along a T-slot track, which is set in workbench
Workbench
A workbench is sturdy table at which manual work is done. They range from simple flat surfaces to very complex designs that may be considered tools in themselves. Workbenches vary in size from tiny jewelers benches to the huge benches used by staircase makers...

 or table for a router, drill press, or bandsaw. T-slot nuts are also used with extruded aluminum framing, such as 80/20
80/20 (framing system)
80/20 is a framing system using extruded beams of 6105-T5 aluminium alloy. The integral T-slots create the foundation for the profile's assembly technology. Accessories are also available, which are specific to each framing system...

, to build a variety of industrial structures and machines.

It is very similar to the "channel-and-groove design" used in some toys
Fischertechnik
FischerTechnik is a brand of construction toy. It was invented by Artur Fischer and is produced by FischerTechnik GmbH in Waldachtal, Germany. Fans often refer to FischerTechnik as FT or ft. It is used in education for teaching about simple machines, as well as motorization and mechanisms...

.

Further reading

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