Guillotine

 Guillotine (ギロチン) is an indestructible hazard from Mega Man X7 that appears in Tornado Tonion's Radio Tower stage. It rotates near pits, making the player fall if hit during a jump.

Other media
Guillotine has a cameo appearance in Rockman X7 4Koma Manga Kingdom, where Axl wonders if he could use a fast Guillotine to cool down while in Flame Hyenard's stage.