File:ElizalinaFlag.jpg

Summary
Description: The Flag of the Elizalina Alliance of Independent Nations. It consists of twenty-one eight-pointed yellow (') stars in a diamond pattern, with the four larger ones placed on the four and the largest star in its center, on a blue (') field.

Source: Toaru Majutsu no Index III Episode 18

Note: Temporary image, hard to get one of good resolution. Either wait for a better image from the anime or redraw the flag for the wiki.