Examples

The entity for the copyright symbol (©) is a built-in special character, so all you have to do to display it is use this entity:

©

To display the uppercase greek letter sigma, you must first include the helpchar.ent file (at the top of your help volume with your other entity declarations) as shown here:

<!entity  SpecialCharacterEntities  FILE   "helpchar.ent">  
&SpecialCharacterEntities;

Then you can place the following entity reference where the sigma character is to appear:

&Usigma;

As with any entity, case is not significant in the entity names for special characters.