Commonly used for a driver's blind spot, but also for any area where visibility or awareness is blocked.
Please be careful of blind spots when driving.
dead angle; dead ground; dead space; sector without fire
Military and tactical term for an area that cannot be covered by direct fire or observation.
The enemy attacked from a dead angle.
This camera has a blind spot.
This position has many dead spaces.
The bicycle ended up in the driver's blind spot.
A blind spot easily forms behind large trucks.
This mirror is installed to eliminate blind spots.
They attacked by exploiting the enemy's blind spot.
死角 describes a physical or figurative blind spot where one can't be seen, whereas ノーマーク in sports means a player who simply isn't being defended.
四角 (a square/rectangle) is pronounced identically to 死角 but has a completely unrelated meaning of shape.
視覚 (the sense of sight) shares the same reading as 死角 but means the visual faculty itself, not an unseen area.
資格 (a qualification or license) is a homophone of 死角 with an entirely different, unrelated meaning.
Standard kanji spelling; used in both everyday and technical contexts.
Compound of 死 (death, dead) and 角 (angle, corner), literally 'dead angle'. The exact historical derivation is uncertain, but the term is conventionally associated with areas where vision or fire is blocked.