Tack

The forward lower corner of a sail.

How to sign

Use Dominant 1-hand, palm down. The base or passive hand is Non-dominant flat-B: sail plane; mast/forestay level established. Set the sail triangle. Start at the low forward corner. Make a short touch or point at the forward lower attachment point. Hold at the tack; add a downward attachment stroke only when rigging detail is needed. Establish the sail triangle. Point to its low forward corner at mast, forestay, or bowsprit level; add DOWN-ATTACH if describing rigging.