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  • Migrated to GDrive

Ice Age—use initial caps for the most recent glacial period, lower case for all other references (American Heritage Dictionary, Third Edition). [revised 2/00]

i.e.—stands for "id est" (that is); not italicized, and always set off by commas 

imagery, satellite—see satellite-based imagery

initials, two or more—no space between them in individuals' names: T.N. Krishnamurti. See also "names."

in situ—not italicized, no hyphen as modifier; means "in (a fixed) position," i.e., neither mobile nor flying aboard aircraft or satellite.

I/O—input/output (computer term)

instrument names—use initial caps for instruments and instrument systems: Limb Radiance Inversion Radiometer (LRIR), Advanced Coronal Observing System, S-Band Dual Polarization Doppler Radar (S-Pol), but S-Pol radar.

internei—lower case as of 2016

internet addresses—Use roman, not bold or italic, for email, internet, and other electronic addresses.

Intermountain West—use this spelling.

ionization states—(series) are given by capital Roman numerals—Fe XI, Ba II, etc. Use a space (not a hyphen) between the element abbreviation and roman numeral. See complete list of chemical elements in The Chicago Manual of Style.

Iris giclée—Iris is a brand name, giclée is a coined term for a fine art or archival inkjet print.

isotope numbers—in outreach materials, write this way: The isotope carbon 13 (C-13) [spellout is open, abbreviation takes a hyphen]. For scientific/technical material: to abbreviate, put the number before the element: 13C, 90Sr, etc. 

italics—Try to reword rather than use italics for emphasis; use italics for emphasis only as a last resort.

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