Sion

indecl., in NT anarth., but in LXX when used of the city of Jerusalem, ἡ Σ. ; Zion the mountain: in typical sense, of the Church, ; of heaven, . He 12:22 Re 14:1 The city, i.e. Jerusalem; in poetical sense; of the inhabitants: , , ; θυγάτηρ Σ Mt 21:5 Jo 12:15 (LXX) in wider sense, of Israel: ; Ro 11:26 fig.: , , .† τίθήμι ἐν Σ λίθον Ro 9:33 I Pe 2:6 (LXX)

Sion (i.e. Tsijon), a hill of Jerusalem; figuratively, the Church (militant or triumphant)

Sion