Definition of "graticule" []

• A grid of horizontal and vertical lines. (noun)
• (UK) Synonym for reticle (noun)
• The network of lines of latitude and longitude that make a up a coordinate system such as the one used on the Earth. (noun)
• A nearly square or nearly rectangular region created by a graticule. (noun)

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• "I have just learned via a MetaFilter post the word graticule, which is obscure enough that it's not in the American Heritage Dictionary."
• "The geohashing algorithm generates a point on the Earth within each square bordered by integer latitude and longitude lines (known as a graticule)."
• "Nor does the clip look as if it originated from military equipment – you would normally expect to see embedded graticule markings, time stamps and other coding."