Where to Configure Hole Callout Symbols

 When setting up  Hole callout dimensions there are symbols in the  callout that display as text. 

 The Callout symbols can be configured under Menu-> Preferences-> Drafting-> Common-> Prefix/Suffix. These settings will apply to any newly created Hole Callout dimensions.

 Existing Hole callouts can have their Settings edited and the Prefix/Suffice can be modified.