Developed by General Electric in 1962 – and still in use today, largely through emulation – General Comprehensive Operating System [http://foldoc.org/GCOS] (GCOS) is a family of operating systems oriented towards mainframe computers. Traces of GCOS influence remain today in modern UNIX systems, in particular the gecos field – an entry

One is a number, a numeral and a glyph. (A number is an idea; a numeral is how we communicate that idea; and a glyph is its formal, typographic representation.) One represents a single entity, a unit of counting or measurement. For example, a line segment of ‘unit length’ is