[texhax] symbol for triple vertical 'x'

[Sarah Bluhme]

Hello,

Does anyone know of the convention, commonly used in the field of 
history(?), to mark recurring text passages with three 'x's aligned 
vertically on top of each other. It's supposed to look something like 
the following, only that the three 'x's should fit into one line.

x                    x      
x  text to be marked x
x                    x

Is there a symbol for it in Latex or a package that provides it, and how 
can I get it? Or failing that, how can I create my own symbol for it?

Many thanks in advance,

Sarah Bluhme