A stub is an article or section on OrthodoxWiki which is underdeveloped. It often consists of only one paragraph, a rough outline, or incomplete information.
If you find a stub on OrthodoxWiki, you can either fix it by editing it to include more material or at least calling it to others' attention, marking it as a stub by including the {{stub}} tag in the article or section body and including [[Category:Stubs]] at the bottom of the article text.