Engineering drawing drawing on A3 may be enlarged to A2 or reduced to A4. The U.S. customary "A-size" corresponds to "letter" size, and "B-size" corresponds to "ledger" or "tabloid" size. There were also once British paper sizes, which went by names rather than alphanumeric designations. American Society of Mechanical Engineers (ASME) ANSI/ASME Y14.1, Y14.2, Y14.3, and Y14.5 are commonly referenced standards in the U.S. Technical lettering is the process of forming letters, numerals, and other characters in technical drawing. It is used to describe, or provide detailed specifications for an object. With the goals of legibility and uniformity, styles are standardized and
Black letter law Black letter law In common law legal systems, black letter laws are the well-established legal rules that are no longer subject to reasonable dispute. Some examples are the "black-letter law" of contracts or the "black-letter law" of trademarks. Black-letter law can be contrasted with legal theory or unsettled legal issues. In an 1831 case in the U.S. Supreme Court, "Jackson ex dem. Bradford v. Huntington", the phrase "black letter" was used: "It is seldom that a case in our time savors so much of the black letter, but the course of decisions in New York renders it unavailable...". The phrase