A lisp, also known as "stigmatism" is a  speech impediment in which a person misarticulates sibilants (, , , ), (, , , ). These misarticulations often result in unclear speech.

The *Lisp (aka StarLisp) programming language was conceived of in 1985 by Cliff Lasser and Steve Omohundro (employees of the Thinking Machines Corporation) as a way of providing an efficient yet high-level language for programming the nascent Connection Machine.

Lisp (historically, LISP) is a family of computer programming languages with a long history and a distinctive, fully parenthesized Polish prefix notation. Originally specified in 1958, Lisp is the second-oldest high-level programming language in widespread use today; only Fortran is older (by one year). Like Fortran, Lisp has changed a great deal since its early days, and a number of dialects have existed over its history. Today, the most widely known general-purpose Lisp dialects are Common Lisp and Scheme.

Lisp in Small Pieces (Cambridge University Press, 1996 ISBN 0-521-56247-3; paperback edition (December 4, 2003) ISBN 0-521-54566-8; translated by Kathleen Callaway) is a book by Christian Queinnec on Lisp, Scheme and other related dialects, their interpretation, semantics, and compilation and contains code for 11 interpreters and 2 compilers.