How the familiar seven symbols combine, where subtractive forms belong, and why historical examples do not always follow modern rules.
Reference
General
A bridge between artists’ vocabulary and technical color models, from hue and chroma to RGB, HSL, and hexadecimal notation.
Typography
A field guide to dashes, quotes, primes, dots, slashes, and other marks that look similar but perform different jobs.
Dimensions, proportions, and everyday uses of the ISO A series, with a comparison to North American Letter and Legal paper.
Language
CommonMark-based examples for turning plain punctuation into headings, emphasis, lists, links, quotations, and code.
The sorting choices behind a useful index, including spaces, punctuation, numerals, prefixes, subentries, and cross-references.
Timekeeping
A practical guide to signs, hours and minutes, conversions, and the important difference between a fixed offset and a time zone.