Gradian, also known as gon, is a unit of measurement for angles, where one gradian equals 1/400 of a full circle or 9/10 of a degree. This unit measures angular displacement and is symbolized as 'g'. The gradian is predominantly used in France and certain other countries for various practical applications, particularly in the field of surveying. Its decimal-based system makes calculations and conversions straightforward. Although not as universally recognized as radians or degrees, the gradian holds significant value in specific scientific and engineering contexts, especially where precision and ease of calculation are paramount.