What is this weird message on my lock screen (clock, not personnal message)?

[AC Question]

Weird message on lock screen (clock, not personnal message)

have the Samsung Galaxy S4 and just recently I have noticed that I have the Samsung Galaxy S4 and just recently I have noticed that my phones lock screen (set to clock, not personal message) just under the date has a weird message, "J Jo."
I believe I must have done something while it was in my pocket. I'm curious of how to get rid of this problem