A button knot is a knot that forms a bulge of thread. Button knots are essentially stopper knots, but may be esthetically pleasing enough to be used as a button on clothes.

The single-strand button is a third type of knob knot, in which the working end leaves the knot at the neck, parallel with the standing part, so that the two parts, or ends, together form a stem. The lay of the two ends is the same, and the knot is symmetrical throughout.

— The Ashley Book of Knots^[1]

There are many methods for tying button knots, such as the Chinese button knot, the Celtic button knot and the monkey fist. The Ashley Book of Knots contains over a hundred examples.

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  Celtic button knot single, with 4 steps of tying it
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  Celtic button knot double, flat and tightened forms
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  Celtic button knot formed on the bight, untightened - flat
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  Celtic button knot formed on the bight, tightened
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  Chinese button knot front side
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  Chinese button knot back side
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  Rose knot on 2 ropes step1 wall
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  Rose knot on 2 ropes step2 crown
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  Rose knot on 2 ropes step3
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  Rose knot on 2 ropes step4 second wall
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  Rose knot on 2 ropes step5
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  Rose knot on 2 ropes step6 second crown and tucked ends
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  Rose knot on 2 ropes top view
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  Rose knot on 2 ropes side view
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  Rose knot on 2 ropes back view, animated tying
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  Rose knot on 4 ropes
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  tying of Rose knot on 4 ropes
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  Pairs of monkey's fists formed as cufflinks in silk
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  a larger monkey's fist formed with a thicker rope
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  a heavy monkey's fist for throwing with an eye splice