The number of individual coils inside a multi-coil accessory such as a mat or pad. Knowing the count tells you how the device distributes its field across the target area: a 4-coil mat covers a wider zone but each coil contributes a smaller share of the total drive than a single-coil disc would. Each coil's peak location is identified from the field measurements and reported individually, so you can compare output and positioning across all coils in the accessory.
A mat spreads many coils across a wide surface, and each coil lays down its own field footprint. How many coils there are is the coil count, how they are arranged is the coil layout, and the surface they cover together is the coverage area. When every coil peaks at about the same strength the coverage is uniform, and the field that spills from one coil into its neighbor is neighbor coupling.
