A "nail" is a traditional unit of length used for measuring cloth or fabric, particularly in some regions of India. The nail is based on the width of a finger, and it is typically equal to approximately 2.25 inches or about 5.715 centimeters.
Nails were historically used in the textile and clothing industry to measure the width of cloth or fabric. However, like many other traditional units of measurement for textiles, the nail has largely been replaced by more standardized and metric units, such as inches, centimeters, or meters, in modern times.
A "pica" is a unit of measurement commonly used in typography and desktop publishing to represent the size of text, fonts, and other elements on a printed page. The pica is part of a system of measurement used in the field of typesetting, which involves arranging and designing text for printed materials.
In the pica system:
1 pica (abbreviated as "p") is equal to 12 points. 1 point (abbreviated as "pt") is approximately equal to 1/72nd of an inch.
So, 1 pica is roughly equal to 1/6th of an inch.
This system is based on the traditional point system used in printing, where a point is a very small unit of measurement. Picas and points are still widely used in the design and printing industry, especially when specifying font sizes, line spacing, and other layout details for printed materials like books, magazines, and newspapers.
In digital design and modern desktop publishing software, you can often switch between using picas and points or other units like inches, millimeters, or pixels to set and adjust the layout of text and graphic elements.