What's this Brrrrrrr?

Just wondered why at the end of various posts (perhaps all - I havent read them all!)... there's a little line of text like this......

_________________
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Its no big deal....I'm just curious. By the way, I'm on Firefox - maybe thats why.

(presumably there will be another one here now)

Yes I have wondered that as well, I thought it is where your signature goes if you choose to have one.

First you see it now you don't. Thanks Mr I.

Its similar to an error code within the signature area, I will start removing them. Thanks for bringing it to my attention, I had noticed them but not got around to removing it.