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About these units
Ell (ell)
The ell is a traditional European unit of length, varying between 45–70 cm depending on the region. It originated from the forearm or arm length and became standardized in many countries for measuring cloth and textiles. In commerce, the ell simplified transactions, allowing merchants to describe fabric lengths efficiently. In tailoring, it offered a consistent basis for cutting and patterning clothing. The unit was essential in guild systems, where precision and repeatability in textile production were critical. While largely obsolete today due to the metric system, the ell remains significant for historians, textile scholars, and anyone studying pre-modern European commerce and craft practices.
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.