IPhone 5c makes odd sound when locked?

Every time I hit the button on the top of my phone to lock it, it makes the normal click noise its supposed too. But after that it makes a noise that sounds like a symbol for lack of better words. That is the only thing I know how to describe it as. What the heck is it?

Added (1). The sound is very quick also.

It's just the new iOS 7 lock sound. I don't like it either.

Fddfghgfd

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