Forming the geographical grid of the planet, equal-spaced latitude lines run east to west and longitude lines (meridians) mark north to south on maps of the world. Values measured in degrees mark off the Earth's directional grid lines allowing accurate angular latitude and longitude coordinates of location description anywhere on the Earth. This same grid system provides geological location identification as well for creating even more detailed mapping of specific locations of valuable mineral and metal lodes, archeological sites and other scientific-related fields.
Providing electrical energy to consumers uses two main interconnecting systems making up the electrical grid. The transmission system sends electricity from power plants to the secondary distribution system. Customers receive electricity distributed through substations sending the electromagnetic signals carried on special networks of high-tension cables. The national electrical grid includes multitudes of local area electric networks serving local energy needs as well as meeting remote customers.
Use of grids by 13th- to 14th-century scribes for organizing handwritten manuscripts exemplifies the organizational characteristics of this multi-purpose tool. Graphic design and publishing grids allow structure and organization of related design ideas. Using a fully-designed grid system for multi-page layouts with graphics, color and written copy provides an efficient process. The flexibility of using a grid for design permits unlimited creative ideas that draw the user into the published information.
Typically, the crossword puzzle grid is a 15 by 15-inch black and white blocked square. All crossword grids are symmetrical so when the puzzle is turned upside down the black and white squares have the same location as when right side up with no huge shapes or clusters of either black or white square distribution.