Batten pocket
A sleeve in a sail that holds a batten.
How to sign
Use Dominant flat-B, then dominant 1-hand: batten. The base or passive hand is Non-dominant flat-B, palm down: sail plane. Set the sail plane. Hold the dominant flat-B across it as a short narrow sleeve. Trace the sleeve once, then insert the 1-hand line into the sleeve. Stop with the batten line inside the sleeve; keep the sail plane. Set the sail plane with a flat-B hand. With the other flat-B hand, trace a short narrow sleeve across the sail, then insert a 1-hand line into it.