How to set string to NULL (Hex value 00)

From: User Name (me_at_attbi.com)
Date: 03/31/04 

Date: Wed, 31 Mar 2004 04:52:54 GMT

Hi,
I tried to set a string to NULL with the following statement, but it
always get c080. Does anybody know hot to do it? TIA
set str [binary format h* 0]
puts $str

When I ran the above statements, and redirect to a file. It has c080
values

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