IX monogram
The IX monogram or XI monogram is a type of early Christian monogram, namely Christogram, looking like the Cyrillic letter Ж or the spokes of a wheel, sometimes within a circle. The IX monogram is formed by the combination of the letter "I" or Iota for Iesous (Ιησους, Jesus in Greek) and "X" or Chi for Christos (Χριστος, Christ in Greek).