Page 167 - Eric C. Fry - Knots and Ropework

Consider the two knots shown in Fig 3. Are they both
reef knots? The lower has been ca!led a thief knot, but to 90
avoid confusion with the draw hitch (a fire-service term),
also sometimes calted a thief knot, perhaps a combination 'Threef'Knot
of thief and reef is preferable.
It is a 'tell-tale' knot, which if used to tie the neck of a
sea-bag for instance, may not catch a thief but will
indicate some interference, as the chances are that the
intruder wilt re-tie the bag with a normal reef knot.

,