i.e. — means that is. It is always followed by a comma.
in-state, out-of-state — When appropriate, use Texas resident and nonresident to be more precise.
Incorporated — Abbreviate and capitalize as Inc., when used as part of a corporate name; do not set it off with commas unless the company does so. Drop Inc. on second reference, even if it is part of the formal name.
international students — Use this term rather than foreign students.
initials — Use periods and no space when an individual uses initials instead of a first name.
H.P. Monklin, J.A. Johnson
Internet — Always capitalize. Referring to the Net is acceptable.
irregardless — The correct word is regardless.
italics — The Associated Press 2012 Stylebook does not italicize words in news stories.