|Thief knot, Bag knot, Bread bag knot
|Reef knot, Granny knot, Grief knot
|jamming, but not always
The Thief knot resembles the square knot, aka reef knot except that the free, or working, ends are on opposite sides. It is said that sailors would secure their belongings in a ditty bag using the thief knot, often with the ends hidden. If another sailor went through the bag, the odds were high the thief would tie the bag back using the more common square knot, revealing the tampering, hence the name.