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PHY is an abbreviation for the physical layer of the OSI model and refers to the circuitry required to implement physical layer functions. A PHY connects a link layer device (often called MAC as an abbreviation for media access control) to a physical medium such as an optical fiber or copper cable.
Phylactery may refer to: Tefillin, boxes containing Torah verses worn by some Jews when praying; An amulet or charm, worn for its supposed magical or supernatural power; A speech scroll in medieval art, which contains or represents speech; In fantasy. An object used by a lich to contain its soul and protect it from death, common in fantasy games