From the longer Wikipedia page  which gives the alphabet:
Malachim was an alphabet published by Heinrich Cornelius Agrippa  in the 16th century. It is derived from Hebrew and Greek. Other alphabets with a similar origin are the Celestial Alphabet and Transitus Fluvii.
"Malachim" is a plural form from Hebrew (מלאך, mal'ach), and means "angels" or "messengers", see Angels in Judaism.