I will level with the like. It appears we don't have a policy on stubs here. I found a minute ago that Leo was labeled one, which was beyond wrong.
I "thought" a stub was 320 bytes article, but recently the place I get that number from Community Central:Spotlights page has changed it to 300 bytes.
Text from them:
The wiki should have at least 200 content pages, not counting stubs. Very short articles (less than about 300bytes; listed at Special:Shortpages) and articles marked with a stub template should make up no more than 1/5th of all pages on the wiki.
One may ask how you find out how many bytes a article is. You only need to check the article's history. If your already at the article, add to the url "?action=history" and then look at the last edit at the top of the page.