Chunk:Help screen column header Alias
From Joomla! Documentation
- Alias. The internal name of the item. Normally, you may leave this blank and let Joomla! fill in a default value. The default value is the Title or Name in lower case and with dashes instead of spaces. You may enter the Alias manually. The Alias should consist of lowercase letters, and no blank spaces are allowed. Use a hyphen (-) instead. The Alias will be used in the URL when SEF is activated.