My locale is en_US.utf-8:

[vbraun@volker-laptop-two ~]$ echo $LANG
en_US.utf8
[vbraun@volker-laptop-two ~]$ sage 
----------------------------------------------------------------------
| Sage Version 4.7.rc2, Release Date: 2011-05-11                     |
| Type notebook() for the GUI, and license() for information.        |
----------------------------------------------------------------------
**********************************************************************
*                                                                    *
* Warning: this is a prerelease version, and it may be unstable.     *
*                                                                    *
**********************************************************************
sage: print u'\u2282'
⊂

But I agree of course that we would have to trap errors on non-unicode 
locales. Also, since you can just escape unicode in strings we could easily 
have 7-bit clean source files. 

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