RFID cards representing the Three Principles or Essentials of alchemy (the four triangles represent the Four Elements), used to initiate various robomantic operations. The same tech could be used with tags attached to the outside or hidden inside of occult objects to trigger events when the objects are placed at or removed from certain locations. IG
The universal medicine is, for the soul, supreme reason and absolute justice; for the mind, it is mathematical and practical truth; for the body, it is the quintessence, which is a combination of gold and light. In the superior [spiritual] world, the first matter of the great work is enthusiasm and activity; in the intermediate [mental] world, it is intelligence and industry; in the inferior [material] world, it is labour; in science it is sulphur, mercury, and salt, which, volatised and fixed alternately, compose the Azoth of the sages. Sulphur corresponds to the elementary form of fire, mercury to air and water, salt to earth.
—Éliphas Lévi, Dogme et Rituel de la Haute Magie