This symbol is an ancient Greek monogram of "Jesus."
'I rule the heavens I made the earth
yet I stopped in wonder
to dance at your birth
I hung the stars I placed the moon
yet I look forward
to long talks with you
I am your Healer comfort I send
Redeemer, Messiah, yet...
I call you Friend.'
John 15:13-15, Proverbs 18:24