Cushan

CUSHAN koo’ shăn (כּוּשָׁ֑ן, LXX (Αἰθιόπων). A name which occurs only once in a description of Yahweh coming from the area of Sinai (Hab 3:7). The LXX understood the passage to refer to Ethiopia. The parallelism with “the curtains of the land of Midian” may indicate that the region near Midian is meant, and Cushan may be an old name for that area. Perhaps the CUSHITE designation for the wife of Moses (Num 12:1) means she was a Midianitess.

International Standard Bible Encyclopedia (1915)

kushan: In the psalm of Habakkuk (Hab 3:7) "the tents of Cushan" are mentioned in an individualizing description of the effects of a theophany. Parallel is the phrase "the curtains of the land of Midian." Septuagint renders Cushan, kushan, by Aithiopon, reading perhaps kushim, or kushin (kushin). The context indicates that the same land or people is intended as the Old Testament elsewhere calls Cush, yet vaguely and not in any strict geographical usage that would limit it to Africa.