For some reason my user-handle, which is Parameter Π², didn’t come out right when I first registered.
Any suggestions or comments, anyone?
Besides switching your major to chemistry? 
Don’t use “special characters” in names. Stick to non-accented letters of the roman alphabet, and arabic numerals. E-mail an administrator to ask them to fix your username. Tell the administrator “Here’s what I want my username to be, please change it for me.” Expect a one-or-two-day response time since we’re only volunteers doing this in our spare time and we get a lot of e-mails.
I seem to be surviving the memory test at each log in–I’m not cookied.
The weird user-name doesn’t seem to bother anyone. Is it OK, Mr. Winkelried, if I just leave it as it is?
Please, call me Your Excellency.
I suppose I could live with it (though my brain hurts everytime I look at it,) but I’ll ask the other SDMB staff members if it offends their delicate sensibilities.
Little long and bothersome for me, I’d prefer it be changed to something shorter, less character-filled, and less prone to cause problems for people reading the board. (I see potential problems with word wrap and etc.)
Please try again, Parameter. Drop me an email at TubaDiva@aol.com with your 3 best ideas and I’ll change it for you. List in order of preference, please.
your humble TubaDiva
Administrator
Please let me cogitate. It took me nearly two weeks to finally get my current name chosen and registered. 
Unless you, or His Excellency, the Right Honorable, Struck-down-in-Battle, Arnold Winkelried, can change it to a (capital-Pi) raised to the second-power. I first tried this but it seems that all variations were already-occupied names.
Since I don’t know whether or not the term [sym]P[/sym]² is a universal constant or a parameter with the value as we calculate it, the word “Parameter” is not the important part of the name.
The point, Parameter [sym]P[/sym][sup]2[/sub], is that, if I understand this correctly, thread titles and user names are stored in different tables from the posts, and these tables do not accept vBB codes or extended-ASCII/Unicode symbols as legitimate encoding. Might I suggest that you use “Parameter Pi Square(d)” as your nick, and then sign your posts as you do now?
Please let me cogitate. It took me nearly two weeks to finally get my current name chosen and registered.
That is: unless you, TubaDiva, or His Excellency, the Right Honorable, Struck-down-in-Battle, Arnold Winkelried, can change my name to a (capital-Pi) raised to the second-power.
[symbol]P[/symbol]² is the name I first tried, but it seems that all variations were already-occupied names.
Since I don’t know whether the term [symbol]P[/symbol]² is a universal constant or is a parameter, the word “Parameter” is not the important part of the name.
To be more precise, I’m pretty sure that the display of usernames is restricted to the default font for the message board, so the [symbol]P[/symbol] won’t show up in the symbol font, and even though Π (displayed as Π) seems to be the correct HTML code for a capital Pi, it isn’t allowed as part of a username by the vBulletin software, and probably wouldn’t show up that way in every browser (maybe only Unicode-capable browsers?) I think you’re out of luck.
I am glad to see you put some thought into your username, since we are loth to have users change their name on a whim.
So Pi[sup]2[/sup] just send myself or TubaDiva some new name suggestions.