I am assuming that you have read, or intend to read the material on the Unicode site page about proposals [1]. I think the obvious name to propose for the symbol is ANARCHY. ANARCHY certainly is a distinct symbol but whether it merits encoding as a text character will be in question unless its use in text can be shown. Symbols in general have a difficult time getting encoded, and with good reason.
If you can find evidence for use of this symbol as text, the most appropriate block in my opinion would be Letterlike Symbols U+2100 to U+214F if that block hasn't been filled by the time ANARCHY gets approved. (There are only five unused codepoints in that block as of Unicode 4.0 and two of those have approved proposed characters tentatively assigned to them.) On the other hand, placing ANARCHY in the Dingbats block would certainly be appropriate according to the principles of Anarchy, altho not according to those of Unicode. [1] http://www.unicode.org/pending/proposals.html
