The glyph.
The Great Glyph of Power was an ancient Ewok symbol. According to legend, it had magical properties to it, making nearby Ewoks recover faster from tiredness. It was thought to be a more powerful version of the Glyph of Power.
The glyph depicted a torch. Ewok glyphs would often be carved on trees where Ewoks lived.
Sources
Ewok Village on StarWars.com (article) (backup link) (First mentioned)
