Modified icon from Nuvola icon theme for KDE 3.x. for a Wikibooks project. Chalkboard showing a 3D cube.
Nuvola_apps_edu_miscellaneous_(no_words).svg
Nuvola_apps_edu_miscellaneous_(no_words).svg: David Vignoni, modifications by DaniDF1995
derivative work: Juetho (talk)