What is the name of the point of intersection of the great circle passing through the celestial north pole P and the Zenith Z, with the celestial equator? (Point T in the figure)
I've checked several sources. Where this term appears in dictionaries, it is translated with a definition, and not a gloss (usually if a direct translation exists in English only a gloss is given) For example https://en.wiktionary.org/wiki/mezzocielo intersection of the meridian of a given place with the celestial equator.
I conclude that English speaking astronomers have not had the benefit of single word translation of mezzocielo.