Syli (GNS) is a historic ISO 4217 currency code withdrawn from use, published by the SIX Group maintenance agency in List Three.
- Currency code: GNS
- Currency name: Syli
- Record: Syli; numeric code 324; withdrawn 1986-02; entity: GUINEA
- List: ISO 4217 List Three (historic currency codes)
- List published: 2026-01-01