A useful knot for tying two ropes (of similar size)
together. I find that it jams up less than the
square knot (a.k.a. reef knot) and is almost as
easy to tie.
In loving ASCII art:
______ ______ ______ ______________
|..... \/ \/ .... \/
|____ . \ __ \. __ . \ ____________
\ . \/ \ \/ \ . \/
/\ . \ /\ \ /\ . \
/ \ . \/ .\ \/ \ . \
/ /\ ./ . /\ / /\ . \
| / \/ . / \/ / \ . |
| \ / . /\ / /\ / . |
\ \/ . /. \/ / \/ . /
\ \. /\ . \ /\ \. /
\ \/ \ . \/ \ \/
___________/\ \__/\ . \__/\ \____
.............\ \ ......\ |
_____________/\______/\______/\______|
Notice that the long ends come in on opposite sides of
the whole knot, and that the short ends exit opposite
each other. Also, each rope crosses over itself once.