The symbol used in the film is not named, but is clearly shown, and is simply the Square and Compasses symbol of Freemasonry.
Madison Square Garden | Times Square | Tiananmen Square protests of 1989 | Trafalgar Square | Square | Leicester Square | Tiananmen Square | Red Square | A Nightingale Sang in Berkeley Square (song) | A Nightingale Sang in Berkeley Square | Square Enix | Soho Square | Rittenhouse Square | Union Square | Harvard Square | Tompkins Square Park | Thompson Square | Root mean square | Washington Square Park | Syntagma Square | Square (company) | Russell Square | Merrion Square | Independence Square | Hanover Square, London | Fitzroy Square | Cathedral Square | Taksim Square | square | Market Square Arena |