What is the "Spray Like" icon in the new MacBook Pro Touch Bar? There is an icon that looks like a spray can on the right side of the Touch Bar (4th-5th button from the right?)

Does anyone know what it is for?

(Sorry I couldn't find an image of it on the web)
It seems to be linked to the simulator in Xcode.



When pressed this expands into some debugging shortcuts as shown in this screenshot:



You can also see this icon on 9to5 macs article about the touchbar.
9to5mac link