The name the scribes would not spell out
Open any early Christian manuscript and you will find ΘΣ where the text says “God,” ΚΣ for “Lord,” ΙΣ for “Jesus,” ΧΣ for “Christ” — each with a stroke ruled over the top. These are the nomina sacra, the sacred names, and the habit is nearly universal in Christian copies and unknown in the same form outside them.
The important part is the company Jesus keeps. From the earliest copies we have, his name is contracted the same way God's is.
