Page 275 - Geoffrey Budworth, Jason Dalton "The Little Book of Incredibly Useful Knots"

Spider knot

Some anglers use this strong loop knot instead of the Bimini twist (see pages 122–123) because

they find it easier to tie in heavy monofilament and braid. It is also known as the thumb loop or
trombone loop, and differs from other virtually identical loop knots (known by other names)
only in the tying method.

Form a long bight in the end of the line and cast this in an underhand loop (1). Pinch this loop

between finger and thumb (2), then wrap a turn around both the thumb and the loop, releasing
the forefinger’s pressure momentarily to permit the turn to slip into place (3). Repeat the process
until five turns have been made (4). Take the remaining bight through the loop, withdraw the
thumb, and pull the knot tight (5). Cut off the line close to the knot.