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.
good-bye—Spell this way.
grid—Do not use "5° grid squares" (they are not necessarily squares); use "5° grid areas" or something similar.
ground speed—two words
Gulfstream V—Always mention HIAPER on first use: The NSF/NCAR HIAPER Gulfstream V. No hyphen — neither when spelled out nor when abbreviated on second use: the GV [revised 09/2016].