Angel of Yahweh - Angel of the Lord, i.e., God himself. Whenever the expression occurs in the Old testament, it is a periphrasis. The earliest versions of the Old testament had, in the opinion of later scribes, too many direct interventions of God in human affairs; the use of "angel of Yahweh" or "angel of the Lord" was by way of reducing His earthly appearances and the carrying out his commands through the agency of angelic intermediaries.
Angel-Year - The angel-year, according to Cornelius Agrippa and other occultists, is either 145 years or 365 years.
Angel of Yetzirah - Sammael or Satan. [Rf. Fuller, The Secret Wisdom of the Qabalah] the word yetzirah is Hebrew for information. In the cabala, the world consists of 4 great divisions, of which yetzirah was one.