Yep and you can hold alt/option when clicking the Notification Centre icon to turn Do Not Disturb on/off. And on Bluetooth to get diagnostic reports. And on Volume to see AirPlay speakers or choose alternate microphones.
By the way, if you already have System Preferences on the Dock you can right click on the icon to bring up a list of all the preference panes as well, and just select the one you want directly from there.
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