Alphanumeric grid

An alphanumeric grid (also known as atlas grid[1]) is a simple coordinate system on a grid in which each cell is identified by a combination of a letter and a number.[2]

	a	b	c	d	e	f
1	a1	b1	c1	d1	e1	f1
2	a2	b2	c2	d2	e2	f2
3	a3	b3	c3	d3	e3	f3
4	a4	b4	c4	d4	e4	f4
5	a5	b5	c5	d5	e5	f5
6	a6	b6	c6	d6	e6	f6

An advantage over numeric coordinates such as easting and northing, which use two numbers instead of a number and a letter to refer to a grid cell, is that there can be no confusion over which coordinate refers to which direction. As an easy example, one could think about battleship; simply match the number at the top to the number on the bottom, then follow the two lines until they meet in a spot.

Algebraic chess notation uses an alphanumeric grid to refer to the squares of a chessboard.[3]

Some kinds of geocode also use letters and numbers, typically several of each in order to specify many more locations over much larger regions.

References

http://encyclopedia2.thefreedictionary.com/atlas+grid Retrieved 2010-03-22.
"Archived copy". Archived from the original on 2007-10-10. Retrieved 2010-03-22.CS1 maint: archived copy as title (link) Retrieved 2010-03-22.
http://www.fide.com/fide/handbook?id=125&view=article Appendices in World Chess Federation Handbook: see part C.7 of section C. Algebraic notation. Retrieved 2010-03-22.

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[1] ttp://encyclopedia2.thefreedictionary.com/atlas+grid Retrieved 2010-03-22.

[2] "Archived copy". Archived from the original on 2007-10-10. Retrieved 2010-03-22.CS1 maint: archived copy as title (link) Retrieved 2010-03-22.

[3] ttp://www.fide.com/fide/handbook?id=125&view=article Appendices in World Chess Federation Handbook: see part C.7 of section C. Algebraic notation. Retrieved 2010-03-22.