When you are beginning a new project, you may find it convenient to map out the symbol names you need before creating the resources they will be assigned to.
To create a new symbol using the Resource Symbols browser
If you type a symbol name that already exists, a message box appears stating that a symbol with that name is already defined. You cannot define two or more symbols with the same name, but you can define different symbols with the same numeric value. For more information, see Symbol Name Restrictions and Symbol Value Restrictions.