http://www.jesus-is-savior.com/Wolves/helen_keller.htm
The "El Diablo" hand sign often is con-fused with the deaf hand
signal of the phrase, "I love you." The person who invented, or
created, the hand sign system for the deaf, Helen Keller, was
herself an occultist and Theosophist. Did Keller purposely design
the deaf's "I love you" sign to be such a remarkable imitation of
the classic sign of Satan? Was Keller saying, basically, "I love
you, Devil?"
Anyway, the deaf sign is slightly different in that the thumb is
extended.