Would it not just be "mission"? Companies have a mission, projects (should) have a mission, there may be details but the mission is what's guiding you the whole time, right?

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whoamii 3 hours ago | parent [-]

Mission is continuous, North Star is usually about guiding a journey with an eventual destination.

	▲	dmcgill50 4 minutes ago \| parent [-]
		North Star is used to orient, when you’re lost. This makes sense for Microsoft. They’ve been in the wilderness for a while.