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About these units
Point (pt)
A point is a typographic unit traditionally equal to 1/72 of an inch (in digital typography) or 0.352777 mm. Historically, however, the point system varied widely across regions and printing houses. In the era of metal movable type, each foundry often produced its own proprietary sizes, making typefaces and point values incompatible between printers. The modern point was standardized largely due to the demands of the publishing industry and later digital systems, especially PostScript and desktop publishing software. The point became essential because typography requires extremely fine control over letter height, line spacing, and layout—far beyond what conventional measurement systems could easily express. Designers and typesetters rely on points to specify the sizes of fonts, the spacing between lines (leading), and the thickness of rules or strokes. In digital environments, the point remains foundational even though screen resolutions vary. Software uses points as virtual units that are converted into pixels depending on display density. Thus, the point bridges the traditional world of print with modern digital rendering, maintaining continuity in the long history of written communication.
Exameter (Em)
An exameter, equal to 10¹⁸ meters, reaches into the interstellar and even intergalactic scale. It is useful for describing the dimensions of star clusters, distances between major astronomical features, or large-scale cosmological structures. Only a handful of physical phenomena require expression in exameters, and even then, astronomers typically prefer parsecs or light-years. The unit sees more use in theoretical physics, cosmology, and data modeling where SI uniformity is necessary. For example, mathematical simulations of the universe's evolution may employ exameters in their internal computations. Although too large for everyday use, the exameter highlights the vastness of the universe and the adaptability of the metric system to describe phenomena across incomprehensible scales.