U+2001 " " Em Quad Unicode Character

U+2001 " " Em Quad is a typographic whitespace character specifically designed to be exactly one em in width, which is a unit of measurement equal to the current font's point size, typically the width of a capital letter M. Unlike smaller spaces such as the en quad, the em quad provides a substantial amount of blank horizontal space and is historically used in typesetting to create large indents or to fill lines in justified text, though in modern digital typography it is often replaced by other spacing methods.