On the initial use of an unfamiliar acronym within a document or a section, spell out the full term, and then put the acronym in parentheses. Put both the spelled-out version and the acronym in boldface. For example:

This document is for engineers who are new to the Telekinetic Tactile Network (TTN) or need to understand how to order TTN replacement parts through finger motions.

Here are the guidelines for acronyms:

• Don't define acronyms that would only be used a few times.
• Do define acronyms that meet both of the following criteria:
  • The acronym is significantly shorter than the full term.
  • The acronym appears many times in the document.