Ring
A circular ring-shaped member whose diameter is much larger than any of its other dimensions. The ring's cross-section can have any shape (e.g., circular, pentagon, etc.).
Also see —
Disk
Rod
Thin-walled tube
A circular ring-shaped member whose diameter is much larger than any of its other dimensions. The ring's cross-section can have any shape (e.g., circular, pentagon, etc.).
Also see —
Disk
Rod
Thin-walled tube