Weird icon in status bar on my iPhone 3G - I have no clue what it is!

[kidpaul1]

Can someone PLEASE tell me what that icon between my alarm clock and batter percentage is?!
I've been wondering what it is, I dont know if its nothing serious but I would like to know. I need it to go away - its bothering me -__-
It only appears when i go into an app such as Safari, Contacts, Photos, etc. - I used Settings as an example. It's never there when Im on the home screen.
Is it part of a Cydia app or something??
Let me know, thanks.

 

[MartyF81]

That is not a default icone. It is something by one of the Jailbreak apps you have installed.

Do you have "Unread" emails in your email box? Try marking them all "Read" and see if it goes away.

 

[jornelas]

that's backgrounder, an app you installed after you jailbroke your phone.