Company Writer's Guide

3.Abbreviations with periods, lower-case letters used as nouns, and capital letters that would form another word if “s” alone were added form the plural with an apostrophe and an “s”:

Ph.D.’s x’s and y’s S’s, A’s, I’s

Letter Symbols for Units of Measurement

The following pages are taken from Corporate Standards. These abbreviations should be the only ones used unless stated otherwise in a project-specific document.

[For Illustration Only]

B-3