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Doornail
Historic Usage
Originally used in old architecture, 'doornail' carries a sense of tradition and antiquity. 
Visual Imagery
'Doornail' can evoke a strong image of old, sturdy, hand-forged nails that add character to doors. 
Technically Specific
'Doornail' refers to a specific type of nail, not to be confused with regular nails used in other carpentry. 