• 開幕かいまく — opening of an event / performance
• 閉幕へいまく — closing of an event
• 幕府ばくふ — shogunate government
• 幕内まくうち — top division of sumo wrestlers
• 序幕じょまく — prologue / opening act
• 終幕しゅうまく — final act / conclusion

幕 is a phono-semantic compound: the radical 巾 (cloth) gives the meaning of a drape or curtain, while 莫 (バク) provides the sound. It originally described cloth curtains used on stage or in military tents, later extending to metaphorical uses like eras, acts, and scenes in history or drama.