What is T-Slot and other profiles

What is T-Slot and other profiles t slot rails Brand: Medoon Shop Bed Deck Rails Cleat T Slot Nuts Fits Screws with 38-16 Thread 4PCS,Stainless 38-16 X 1 Hex Head Bolts 4PCS,Tie Down Anchors Rings tyco ho slot cars Our clamping rails are manufactured from high-density, closed-grained and stress-relieved cast iron with added steel They are cast in a special process

tyco ho slot cars Anodized Aluminum Miter T Track wT-Bar Rail for Jigs Fixtures Sleds Router Tables and General Woodworking 32 inch MADE IN THE USA QNK 2pcs 600mm

tonny bruins slot 2PCS 20 Series T Slot 2080 Aluminum Extrusion Profile '',European Standard Anodized Linear Rail for 3D Printer Parts and CNC DIY 400mm Silver  Exporter of T-Slotted Floor Clamping Rails And Floor Skid