Old texts call the watchtower platform above the city gate a 'du'.
Tips
history
闍 is archaic and not used independently in modern Chinese. As dū it named a gate-tower platform; as shé it appears only in Buddhist loanwords like 阿闍黎 (ācārya, a spiritual teacher). The modern words are 城楼 (gate tower) and 瓮城 (a barbican).
register
Classical and religious only — found in old fortification descriptions and Buddhist scripture transliterations, not in modern speech.
