What Are Siri Shortcut phrases

Apps now have ability to prompt the user to define a custom invocation string for a specific shortcut. This allows user to be app action into users own vocabulary. To do this, INUIAddVoiceShortcutViewController to prompt user for a custom shortcut statement. This view controller Takes an INShortcut object that represents the shortcut to be configured. Once the user configure the shortcut with a custom statement, they can view it in MyShortcuts in the settings app under Siri


Reference:
https://willowtreeapps.com/ideas/wwdc-how-to-implement-siri-shortcuts-for-your-app