No you dont have to as it can get confused with an abbreviation. Acronyms
A term that represents a multi-word term. Typically, acronyms are formed in the following ways:
? From the first letters of each word in a compound term, for example Table of Contents (TOC). ? From recognizable parts of a compound term, such as GNU Object Model Environment (GNOME).
Apply the following rules when you use acronyms:
? On the first occurrence of an acronym, spell out the full term, with the acronym in parentheses. ? Do not spell out the full compound for well-known acronyms, unless you think the information is useful for readers. ? Avoid creating new acronyms. Unfamiliar acronyms can confuse rather than clarify a concept. ? Write the acronym in uppercase letters, unless there is a compelling case for lowercase. ? Include the acronym and the full term in the glossary of your manual.