You can edit page types:

• Name - This is displayed when creating or editing a page to the site editor, it may contain spaces. 
• Handle - This is used on the backend as a unique identifier. It may not contain spaces or special characters. 
• Icon - The icons can be managed through the file manager and just provide a simple visual cue.
• Attributes - You can add any custom attribute to any page from edit mode, this list defines which attributes will be displayed in Properties by default. 
• And if need be you can delete them.