noun
Commonly used for a driver's blind spot, but also for any area where visibility or awareness is blocked.
車を運転するときは死角に気をつけてください。
Please be careful of blind spots when driving.
このカメラには死角がある。
This camera has a blind spot.
noun
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.
敵は死角から攻撃してきた。
The enemy attacked from a dead angle.
この陣地には死角が多い。
This position has many dead spaces.
盲点 is a blind spot in a more abstract sense, such as a gap in one's thinking or knowledge, while 死角 is primarily a physical blind spot.
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.