lodestar or loadstar
/ˈləʊdˌstɑː(r)/ Noun. [SINGULAR]
1- a star used as a guide by sailors (to guide the course of a ship) and astronomers , especially the Pole Star (Polaris).
2- [MAINLY LITERARY] any principle that guides or influences somebody's behaviour and actions
3- [FIGURATIVE] a person that serves as a guide
ETYMOLOGY: 14c, from Anglo-Saxon : lad + steorra
ORIGIN: middle english, from "LODE" in the obsolete sense (way, course) + STAR
Who or what is your lodestar ?