An obstacle.
Used other than figuratively or idiomatically: see brick, wall. A wall made of bricks.
Someone who is silent or unresponsive.
A type of anti-aliasing filter with a steep cutoff.
To halt or limit abruptly.
To build a brick wall around.
To be uncooperative and unresponsive.
To filter using a brick wall filter.
The vertical bar ⟨|⟩.