Knots by purpose/function: backing-to-reel ~ backing-to-fly line ~ leader-to-fly line ~ leader-to-leader ~ leader-to-fly ~ loop knots ~ specialty knots 

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"Uni Knot"

Purpose:  The "Uni Knot" is used in fly fishing as an alternate method of tying segments of leader material together.  It is used by some as a substitute for the "Blood Knot" and/or "Surgeon Knot."

Step 1:  Hold the existing/"old" mono segment in your left hand, and with your right, overlap it with the "new", thinner diameter segment about 8-10";

Step 2:  With your left hand, pinch the two pieces together near the middle of the overlap; using your right hand, make a loop in the "old" segment below the "new" as shown;

Step 3:  Wrap the tag end of the "old" mono back through the loop as shown 4-5 times (thicker mono requires fewer wraps);

Step 4:  Tighten this side by pulling the tag end with your right hand while holding the two pieces together in your left hand; pull both the tag and running line sections of the material to cinch down the wraps; 

Step 5:  Do the same thing on the "other side" of this knot, using the opposing/"new" mono, but wrapping in the opposite manner you did on the other side; tighten it up the same way;

Step 6:   The last step is to slide the two knots together and then trim the tag ends of both sections of material.