Lodestar
Definition: a star that guides; a goal to achieve; a future plan
“Lode” is Middle English for “course.” So, literally, it means “a star that shows the course.”
Why I Looked It Up
In The Covenant, in discussing a family’s history in England:
But each brother knew there would be no revisiting, not for them. But for their children’s children, [England] would always be a lodestar.