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The Russian Join is a knotless join which can be done with plyed yarn (one-ply yarn won't work). This tutorial is a good balance of pictures and explanation, makes the technique very clear.

This works on feltable yarns -- that is wool, alpaca etc -- by pulling and fluffing out the ends and then felting them together. Probably works better on single-ply yarns than tightly spun plied yarns.

Very useful yarn-joining technique. Much better than the standard square knot. Suits crochet and knitting, but not Kumihimo; the knot is still too visible.