C

C is an often used programming language because of it's solid structure and it being multiplatform capable.

The initial development of C occurred at AT&T Bell Labs between 1969 and 1973; according to Ritchie, the most creative period occurred in 1972. It was named "C" because many of its features were derived from an earlier language called "B".

By 1973, the C language had become powerful enough that most of the UNIX kernel, originally written in PDP-11/20 assembly language, was rewritten in C.


 * http://en.wikipedia.org/wiki/C_programming_language#History

also see: D