The SP2 is supposed to be (OK, this all made sense when we came up with it) SP to the second power. As in the SP from SteamPunk and SparkPlug put together. We were trying to find a shorter way to say it but didn't want to drop the name because we liked it to much, hence the SP2.
For those that haven't encountered SteamPunk before, here is a good link to give an idea of the style.
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