Bring Up Siri On MacOS Sierra With A Keyboard Shortcut

Mac: Siri is one of the landmark features in Sierra, but while you can call it up in three different ways, a keyboard shortcut is probably the most useful.

By default, you can can invoke Siri by clicking the icon in the menu bar, the Dock or by tapping the keyboard shortcut: Hold Command+Space. You can change this shortcut to whatever you want by heading to System Preferences > Siri, and clicking the Keyboard Shortcut dropdown menu.