"Made using a combination of the letters 'I', 'L', and 'Y' from American Sign Language. It is made by extending the thumb, index finger, and little finger while the middle and ring finger touch the palm. Ironically, this is the symbol used to curse someone in Italian culture."
Miss Keller was herself a satanist. She followed the teachings of Emanuel Swedenborg, a mystic and the author of "Heaven and its Wonders and Hell From Things Heard and Seen". You may want to check out her book "My Religion" as she praises Swedenborg's writings and belief system. You can find a preview of her book here: http://books.google.com/books?id=x7oPaKrr4x4C&dq=My+Religion+Keller&printsec=frontcover&source=bl&ots=xDxycDAUw2&sig=sdadg6ucaJx-BUh8Phh_elGcquU&hl=en&ei=JY6jSdzZEZmQsQPIoZSvAg&sa=X&oi=book_result&resnum=1&ct=result#PPP1,M1
Heaven and Hell is the common English title of a book written by mystic Emanuel Swedenborg in Latin, published in 1758.
The full title is Heaven and its Wonders and Hell From Things Heard and Seen, or in Latin: De Caelo et Ejus Mirabilibus et de inferno, ex Auditis et Visis.
This book is a detailed description of the afterlife where people go after the death of the physical body. It deals with God, heaven, hell, angels, spirits, and devils, which the author claimed to have witnessed first hand.
Some of the things he claims to have experienced are that there are Jews, Muslims and people of pre-Christian times ("pagans" such as Romans and Greeks) in Heaven; the fundamental issue that love of self or of the world drives one towards Hell, and love of God and fellow beings towards Heaven.
Happy reading if you really want to debunk this post!