Inch (in)
Definition: Inch (symbol: in or ") na length unit for imperial and US customary systems. Since 1959, one inch na exactly 25.4 millimeters. You get 12 inches for one foot and 36 inches for one yard.
History/origin: The word inch come from Latin uncia, wey mean one‑twelfth. Early definitions base on natural references: thumb width or three barleycorns wey dem line up. The modern standard definition dem agree internationally for 1959.
Current use: Inch still dey common for United States, Canada, and United Kingdom, especially for human height, screen sizes, and construction materials like lumber and pipes.