U-shaped gutter; U-ditch
A concrete drainage channel with a U-shaped cross-section, commonly used in road and construction contexts.
U-shaped gutters are installed along the side of the road.
At the construction site, they line up U-ditches to make a drainage channel.
Variant using the katakana ユー instead of the Latin letter U.
Compound of the Latin letter U (for the shape), 字 (character), and 溝 (gutter, ditch).