These flares are pretty common. Probably caused by a bright flash or reflection overwhelming the CCD in the camera or a lens flare.
This one is unusual int hat there are two flares at right angles and the vertical one seems to have some very light pink numbers written over them. I can only make out the large 6 in the white part of the flare. You can see pinkish blurs to either side that may have been more numbers/letters.
Double flare with number
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By kjfitz @ 2005-10-11 15:20:09
I dunno, it could be a six, but I'm not convinced. It might just be a 6-shaped smudge...