5516  chi xi stigma  khee 
xee stig'-ma

 the 22nd, 14th and an 
obsolete letter (4742 as a 
cross) of the Greek alphabet 
(intermediate between the 5th 
and 6th), used as numbers; 
denoting respectively 600, 60 
and 6; 666 as a numeral:--six 
hundred threescore and six.

 see GREEK for 4742