From the KJV 1611 with Strong's Concordance
{khee xee stig'-ma}
The 22nd, 14th and an obsolete letter (G4742 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 Revelation 13:18.
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