Sigillum Dei factory Aemeth (John Dee Enochian Angelic Communication) 15 inch diameter Altar Plate

The Sigillum Dei (seal of God, or signum dei vivi, symbol of the living God, called by John Dee the Sigillum Dei Aemeth) is a magical diagram, composed of two circles, a pentagram, two heptagons, and one heptagram, and is labeled with the name of God and his angels. It was an amulet (amuletum) with the magical function that, according to one of the oldest sources (Liber Juratus), allowed the initiated magician to have power over all factory creatures except Archangels, but usually only reserved for those who can achieve the blessed vision of God and angels (beatific visionary).

Here's a great resource explaining the symbolism on the board and how it's used:
https://xenqabbalah.fandom.com/wiki/Sigillum_Dei