A Jedi star compass
Lodestone refers to a specific kind of rock material. This material found its use in both Jedi star compasses and also in wayfinders.
The initial appearance of lodestones occurred within the Star Wars Legends novel, specifically Republic Commando: True Colors, authored by Karen Traviss. Later, they were integrated into the canon through a mention by Pablo Hidalgo in the reference book titled Star Wars: The Last Jedi: The Visual Dictionary.