+2  A: 

At a glance I would say it's unicode characters which don't have a printable representation

JaredPar
+1  A: 

What you are seeing is probably the result of an obfuscator. The characters are appearing as boxes because the font you are using in Reflector does not have a glyph for the character being shown.

I think Dotfuscator does this type of obfuscation. You can check by looking at the attributes of the assembly for a Dotfuscator attribute.

adrianbanks
What really? im pretty sure they're just english character since the ddls i'm disassembling are from an english speaking company.
burnt1ce
Some obfuscators can obfuscate strings within the assembly. I know Dotfuscator can do this.
adrianbanks