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About these units
Famn (famn)
The famn, related to the English fathom, was a Scandinavian unit roughly equal to 1.78 meters. Like other fathoms, it originated as the distance between a person's outstretched arms, making it a natural measure for tasks performed at arm's length. Historically, the famn was used in maritime contexts, forestry, and measuring firewood. Sailors relied on it when describing water depth, rope lengths, and the dimensions of boats. On land, stacked firewood was often quantified in famnar, making the unit central to resource management in cold northern regions. Today, the famn has largely disappeared from practical use, but it continues to appear in maritime literature, folklore, and historical accounts. Its surviving references help illuminate the working methods and daily experiences of Nordic sailors, fishermen, and rural communities prior to metrication.
Terameter (Tm)
A terameter equals one trillion meters (10¹² m) and is used when discussing distances that exceed the scale of the solar system but do not yet reach the interstellar unit category. Large-scale solar system phenomena—such as the size of the heliosphere, the influence boundary of the Sun's magnetic field, or trajectories of far-reaching spacecraft—may be expressed in terameters. While not widely used in astronomical literature (which often prefers astronomical units, light-years, or parsecs), the terameter provides a SI-based unit that aligns cleanly with metric prefixes. It is especially useful in theoretical physics or cosmological modeling where sticking to SI units simplifies equations.