When you create an instance of a symbol, by dragging a copy of a symbol onto the Stage, it is given a default name by Flash. If you make several copies of one button symbol, you should give each one a name related to its function. This will help you to remember what it does. You can do this in the Properties Inspector.

It is good practice to name all button symbols with the prefix btn for example btnBack or btnPlay. This will help you or any programmers that you may be working with to quickly identify the type of symbol that is being used.

The Properties Inspector When a Button Instance Is Highlighted