# Fin

> The keel under the tail that gives a board grip and steering.

**What "fin" means in surfing:** The keel under the tail that gives a board grip and steering.

**Example:** "Lost a fin on the reef."

**Also said:** Skeg

**Category:** Gear

## Related words

- [Thruster](https://surfslang.com/thruster): A board with three fins, the most common setup on modern shortboards.
- [Quad](https://surfslang.com/quad): A board with four fins, giving drive and hold in fast or hollow waves.
- [Twin fin](https://surfslang.com/twin-fin): A board with two fins, fast and loose in small waves.

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Source: [Fin](https://surfslang.com/fin) on Surfslang.com, the surf slang glossary. Full glossary: https://surfslang.com/llms.txt