Last night a new documentary Harry Potter: A History of Magic aired on the BBC.
The documentary was released to mark the 20th anniversary of The Philosopher's Stone.
One of the questions that wasn't answered was the story behind the Deathly Hallows symbol - that is until now.
While sketching the character of Professor Sprout, Rowling was also watching The Man Who Would Be King and says she thinks that her background entertainment may have seeped into her character drawings.
“The Masonic symbol is very important in that movie,” Rowling says in the documentary.
“And it was literally 20 years later that I looked at the sign of the Deathly Hallows and realised how similar they were.
“When I saw the movie again and saw the Masonic symbol, I went cold all over and I thought, ‘Is that why the Hallows symbol is what it is?’
“And I’ve got a feeling that, on some deep, subconscious level, they are connected.”
This drawing of Professor Sprout has a very special meaning for @jk_rowling... #HarryPotter pic.twitter.com/QpoNDV1i0J
— BBC Two (@BBCTwo) October 29, 2017
Fear not - if you missed out on the documentary it will be repeated tomorrow night on BBC Two at 11.15pm.
