烽ㄈㄥfēng燧ㄙㄨㄟˋsuì

敵人來犯，燃火示警，夜間舉火為烽，白天燔煙為燧。漢·桓寬《鹽鐵論·本議》：「故修障塞，飭烽燧，屯戍以備之邊。」宋·張孝祥〈六州歌頭·長淮望斷〉詞：「干羽方懷遠，靜烽燧，且休兵。」

英fire beacon tower (used in frontier regions in former times to relay information about the enemy, using smoke by day and fire at night)

德Signalfeuer