Celestial Alphabet

Heinrich Cornelius Agrippa from Nettesheim published a book in the 16th century entitled Of Occult Philosophy. Page 439 of book III, he describes an esoteric alphabet (supposedly angelic writing) named Celestial, of which here is a scan:

The Celestial script is a substitution of the Hebrew characters for a Celestial glyph/symbol.

A transliteration is therefore necessary to encrypt a word or a sentence from the Latin alphabet (our usual alphabet).

The decryption of the Celestial alphabet is a replacement of the celestial symbols/glyphs with a letter from the Hebrew alphabet. In order to obtain a word or a sentence in English, a transliteration is necessary, however, certain Hebrew characters do not have an equivalent in our Latin alphabet (such as ט or צ), and there are even letters Hebrew with several possible transliterations (like ג for C or G, י for I or J or even ו for F, V or U).

The symbols making up the Celestial alphabet are generally constructed with several straight lines/sticks (sometimes there are a few curved lines) ending in circles at their ends (in the shape of large circular dots) which can make one think of constellations.

Any references to magic, angels, occult/esoteric science, or Agrippa are clues.

The Malachim alphabet as well as the Passing of the River alphabet are very similar.

The publication of Heinrich Cornelius Agrippa's book dates from the 16th century. The author of the alphabet is unknown but it could be an invention of the author himself.