Short answers, pulled from the story.
Ptah is an ancient Egyptian creator deity and patron god of craftsmen and architects. He was believed to have conceived the world and brought it into being through the power of his heart and tongue. In the triad of Memphis, he is the husband of Sekhmet and the father of Nefertem.
The name of Ptah's great temple in Memphis, Hut-ka-Ptah, meaning "Enclosure of the ka of Ptah," passed into Ancient Greek as Aiguptos, then into Latin as Aegyptus, through Middle French as Egypte, and into Middle English as Egipte, eventually becoming the modern English word Egypt.
The Shabaka Stone, an inscription from the Twenty-fifth Dynasty, states that Ptah gave life to all the gods and their kas through his heart and tongue. This text is central to understanding Ptah's role as a creator god who used thought and speech as instruments of creation.
Ptah holds a combined sceptre that fuses three symbols: the Was sceptre representing power, the Ankh representing life, and the Djed pillar representing stability. Together these three symbols express the creative powers attributed to the god.
Ptah was worshipped at temples in Memphis, Karnak in Thebes, Pi-Ramesses, Deir el-Medina, Abu Simbel in Nubia, Gerf Hussein in Nubia, and Abydos, among other sites. Memphis remained the primary centre of his cult throughout Egyptian history.
Ptah is invoked in Verdi's opera Aida in a chorus titled "Possente Fthà," meaning "O Mighty Ptah," in Act 1, scene 2. The invocation is reprised as "Immenso Fthà" at the opera's conclusion as the protagonists Aida and Radames die.