A | B | C | D | E | F | G | H | I | J | M | N | O | P | Q | R | S | T | U | V-Z

i.e.
Abbreviation for “that is,” usually followed by a comma.
Avoid using ex. or e.g. (e.g. is the abbreviation for “for example”)

Inc.
not used in running text; may be included when companies/corporations are in lists, but with no preceding comma (e.g. Nike Inc.)

initials with names
Insert a period after middle initial (e.g., Jane B. Doe). Use a space between two or more initials (e.g., Bob R. K. Smith)

Internet
Always capitalize reference. See also computer terms, Web, and World Wide Web

intranet
Always used lower case. See also computer terms , Web, and World Wide Web

introductory words:
First (not firstly)
Second (not secondly)
Third (not thirdly)