Blade Trap
Ocarina of Time
These spiked obstacles are invulnerable and come in two varieties: ones that move back and forth and ones that try to slice and dice you if you get close. Either way, they cannot be defeated, so just wait for them to get on the far side of you and sneak past. In some puzzles, you can use blocks or statues to put their path so they don't have much wiggle room.
Gallery
Blade Trap Artwork from The Legend of Zelda
Blade Trap Sprite from The Legend of Zelda
Blade Trap Sprite from Link's Awakening
Blade Trap Model from Ocarina of Time
Blue Blade Trap Sprite from Oracle of Seasons and Oracle of Ages
Green Blade Trap Sprite from Oracle of Seasons and Oracle of Ages
OrangeBlade Trap Sprite from Oracle of Seasons
Giant Blade Trap Sprite from Oracle of Seasons and Oracle of Ages
Red Giant Blade Trap Sprite from Oracle of Seasons