What are symbols for safe travel?

A cross, horizontal line longer than vertical, with an arrow point on each end.

Upper left should have a crescent moon and a star, upper right should have a star, lower right a sun. The lower left is blank. Drawn in bark blue on white during the waxing moon and carried during travel, will keep you safe, keep you from being lost and bring you home again.

Many people carry a sea shell when traveling over water - it will bring you safely home.