This is a small issue as Rick said, but I can't resist.
Jerry, are you looking at the same picture? I am looking at the left picture without the arrow.
"I " can't get any dimensions off of anything in that picture since it is stone, not brick and mortar joints will vary as will size of weeps.
The total end of the cable does not appear to be visible, it appears partially obscured by cement around the circumference, IMO.
The small rust spot a short distance to the right does appear the right size and location for a form nail.
I agree with others, this is the usual appearance of a cable end for post tension as is common to this local.
The right photo is just a nail.

__________________
Jim Luttrall
Mr. Inspector.net, Inc.
Allen, Texas 75002