Which knot is known for its reliability in creating a permanent loop?

The figure eight knot is recognized for its reliability in creating a permanent loop due to its secure structure and ease of untying after being under load. When tied correctly, the knot forms a double loop that distributes tension evenly, preventing slippage. This makes it particularly popular in climbing, sailing, and various other activities where a strong, stable loop is essential.

This knot's design allows it to maintain its strength even when subjected to heavy loads, ensuring that it doesn't come undone unintentionally. Additionally, it is relatively easy to inspect visually, allowing users to confirm it is tied correctly before relying on it. The figure eight knot also serves as a foundation for other knots, further highlighting its utility and versatility in different applications.