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gamma—a unit of magnetic field equal to l0-5 gauss
Gandalf Data Communications—the manufacturer; initial caps only
gauge (measuring device)
Gaussian—is capitalized (gauss, the unit, is not)
general circulation model—all lower case
generic plurals—Use lowercase according to the Chicago Manual of Style. Example: "....departments of Defense and Homeland Security." Or "....Mississippi and Minnesota rivers."
Gflops—gigaflops; billions of floating-point calculations per second.
GIF—graphics interchange format. Should be capitalized.
GISS—Use Goddard Institute for Space Studies (NASA). See also "GSFC."
good-bye—Spell this way.
graph scales (ordinate and abscissa)—abbreviate units given in parentheses. Avoid negative exponents where possible. See Numbers. [revised 2/00]
grid—Do not use "5° grid squares" (they are not necessarily squares); use "5° grid areas" or something similar.
ground speed—two words
GSFC—Use NASA Goddard Space Flight Center. See also "GISS."
Gulfstream V—no hyphen when spelled out. Takes a hyphen when abbreviated on second use: the G-V. [01/2010].