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Iso (iso-) is a prefix indicating similarity or equality. It comes from the Greek ίσος, meaning "equal."

Examples of words using iso :

• Isotherm (line of equal temperature)
• Isobar (line of equal pressure)
• Isocline (line of equal magnetic declination in the earth's magnetic field)
• Isohyet
• Isohypse (line of equal groundwater head)
• Isotope
• Isoelectronic
• Isometric
• Isomer (molecules with the same chemical formula but arranged differently)

See also: contour line

ISO or Iso is the common name of the International Organization for Standardization (also sometimes known informally and unofficially as the International Standards Organization). Iso is derived from the Greek word meaning "equal" and is not an acronym.

From this usage the following are derived the following usages:

• An Iso or ISO is a technical standard published by the International Organization for Standardization.
• The ISO number (or Iso number; in context, just ISO or Iso) is a measure of film speed (photographic film's sensitivity to light).
• An ISO file (or Iso file; in context, just ISO, Iso, iso, or .iso) is an ISO 9660 image of a file system.

ISO is also an abbreviation which can stand for:

• International Sugar Organization
• Infrared Space Observatory.
• Independent System Operator in the electric generation and transmission industry
• Institute for Social Organization, an American Jesuit think-tank founded in 1943 and closed in the early 1960s
• International Socialist Organization a political organization active in the United States

Iso may also mean:

• Iso automobile - an Italian automobile manufacturer, developer of the Isetta bubble car and various sports cars.

• Disambiguation pages