In the current UBB there is no font size UBB code. There may be some hacks that might add additional UBB codes or allow html in sigs. You can try asking in the UBB Code Hacking forum, or check the hack database at https://www.ubbdev.com

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Doug
darksaber.hispeed.com
I am altering the deal. Pray I don't alter it any further.
--Darth Vader, The Empire Strikes Back