#23 Ad Crucem Christmon - IX Christogram
The IX monogram or XI monogram is a type of early Christogram looking like the spokes of a wheel, sometimes within a circle.
The IX monogram is formed by the combination of the letter "I" or Iota for IHSOYS (Ιησους, Jesus in Greek) and "X" or Chi for XPISTOS (Χριστος, Christ in Greek). The spokes can also be stand-alone, without the circle.
These monograms can often be found as Christian burial inscriptions in the early church.