Etch

You touch a hard surface made of metal, wood, stone or a similar material. You then inscribe up to 5 markings of your choice in any formation on a 5 foot space on the surface. These markings can be letters, symbols or simple pictures. 

This spell leaves no magical trace and can be removed as if etched there by hand, or by casting this spell again with the purpose of removing a marking. There is no limit to the amount of things you can etch at a time.