noun

• (historical) An ancient settlement in northeastern China within modern Beijing
• (historical) The state which it ruled
• (historical) Yan, a later state and city at the same location
• A county of Linfen, Shanxi, China.
• Initialism of John Innes - a generic range of horticultural composts [A generic range of horticultural composts.]
• Initialism of Jemaah Islamiyah, an Islamist militant organization based in Indonesia