What is the meaning of Zij?

An Islamic book that tabulates parameters used for various astronomical events and movements.

Third person singular feminine subject pronoun; she

Third person plural subject pronoun; they

side (the side of one's body); flank

Archaic form of zijde (silk).

singular present subjunctive of zijn

singular present subjunctive of wezen

singular present imperative of zijn

Source: wiktionary.org