Grid Rule
A grid rule is the mark a letter places under a pale area it has named. This page records that mark in the letter's order and does not fill in cells the letter left out. It does not describe a power grid, it does not draw a street map, and it does not turn the line into a chart for sale.
This page stops at a utility diagram, a power connection, and a map download. None of those are offered here.
Email subject: Grid Rule