The alpine butterfly knot, also known as the "linesman’s loop," has been singled out by adventurers and MacGyvers of all stripes as the world's handiest, multipurpose loop-style knot ever.
The four-in-hand knot is perhaps the simplest to perform, and as luck would have it, the best looking, especially with a little dimple pinched into the face of the tie, just beneath the knot.