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In fishing, there's a knot called "Blood Knot".

Blood Knot

Wikipedia cites The Ashley Book of Knots:

The barrel knot, called blood knot by Keith Rollo, is the best bend there is for small, stiff or slippery line. The ends may be trimmed short and the knot offers the least resistance possible when drawn through water.

But what's the reason for this name?

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Here is the Oxford English Dictionary entry for blood knot, within "blood, n. (and int.)":

blood knot n. (originally) a multiple overhand knot of a kind formerly tied at the end of whips (or ropes used for whipping), to increase the pain of the blows inflicted; (now also) Fishing and Surgery a knot used to tie two ropes or lines together.

These knots are designed to draw blood, as an early example describes:

1863 London Rev. 24 Oct. 435/2 The novice proceeds by stages from tickling herself with a few strands of whipcord to goring her shoulders with hempen thongs full of blood knots.

The meaning switched over to a knot that joins two lines by the 20th century:

1935 E. Taverner & J. Moore Angler's Week-end Bk. 189 Under his critical eye, I joined the two lines with a blood knot. ‘I guessed you were a fisherman,’ he said.

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It's possibly there in the wikipedia article with a bit more digging

"Blood knot" may refer to, "a double overhand knot tied in a cat-o'-nine-tails."

A cat-o' -nine-tails was a whip used for flogging in seafaring.

I imagine it's called a blood knot because it would cause lacerations and draw blood.

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    It's interesting to note that the double overhand knot mentioned in that reference is not the same thing as the "blood knot" as it's known today (and depicted in the OP's image). Though, the double overhand is close to a "surgeon's knot" which is sometimes considered interchangeable with the blood knot in terms of how it's used today to join lines. – dwizum Sep 17 at 20:29

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