A fid is a hollow spike for use in splicing.

A fid is a conical tool traditionally made of wood or bone. It is used to work with rope and canvas in marlinespike seamanship. A fid differs from a marlinspike in material and purpose. A marlinespike is used in working with wire rope, may be used to open shackles, and is made of metal. A fid is used to hold open knots and holes in canvas, and to separate the "lays" (or strands) of synthetic or natural rope for splicing. A variation of the fid, the gripfid, is used for ply-split braiding. It adds a jamming cleat to pull a cord back through the cord split by the fid's point.

vnmr is software for controlling nuclear magnetic resonance spectrometers. It is produced by Varian, Inc.