Scribe line
Beginner
The narrow empty lane between chips on a wafer, where the saw cuts them apart.
Novice
A thin strip left between neighboring dies so they can be sawn apart without damage. It also holds small test structures the fab uses to check the process.
Expert
Normally keep-out for product wiring, since it is destroyed at dicing and carries fab test structures. Wafer-scale designs negotiate special wiring across it so neighboring reticle fields join into one circuit.
Explained in Wafer-scale and SRAM-heavy designs (Architectures).
See also: Die, Wafer-scale integration.