Significat

1. A raised platform built from the shore out over water, supported on piles; used to secure, or provide access to shipping; a jetty.
2. A similar structure, especially at a seaside resort, used to provide entertainment.
3. A structure supporting the junction between two spans of a bridge.
4. A rectangular pillar, or similar structure, that supports an arch, wall or roof, or the hinges of a gate.