This is a randomly generated word/letter combination that websites use to confirm that the person sending the message is in fact a human and not an automated emailing program (aka spambot).
At the bottom of the screen when you are trying to send a message there will be a text box with blurry or fuzzy or in some way oddly formatted writting. Below that there will be a space for you to type the letters displayed in standard format.
The concept is that only a human eye and brain combined can interpret the image and then type in the correct sequence.
Sorry i can't remember the technical term for this security method or i'd post some links to explain it better.
8/23/2012 at 3:17 AM
BUT THE ONE I REPLIED (A MESSAGE), THERE NO TEXT BOX AND NO SPACE FOR TYPING!