TeX
Category:Encyclopedia'''''' (the X stands for the greek Χ letter and so pronounced as ''ch'' in te''ch''nics, and written with a lowercase 'e' in imitation of the logo) is a typesetting language and system designed and mostly written by Donald E. Knuth.
Normally a ''bare'' is hardly usable to typeset, so ''macro packages'' are often used. The basic macro package given as default is ; a very common and widely used macro package is , but there are many.