Why Krishnamurti says K. when he is speaking of himself?

Here is an extract of Pupul Jayakar biography on Krishnamurti and I think it can explain why Krishnamurti was saying K. when he was speaking of himself. "I" in the extract is Pupul Jayakar.

I asked, “Now I have observed you listening to your own response, with the same awareness as you listen to a question. Do you listen to your responses?”

“I listen to it to see if what is said is accurate.”

“You listen to your own responses; and to you, your responses and the responses of another person are at the same level.”

K said, “But if you are talking seriously and you are listening to the questioner and responding, there is an act of listening—in both directions—not the listening to your or my response, there is only listening.”