LISP Logo

AI LISP Logo

Here is a logo for the LISP programing language.

The image is copyright © 2007 by Xah Lee. I release it into public domain.

Note: This logo is a redrawing of a image found on the web. This one:

I do not know who is its copyright owner. It appears to be a logo originating from http://alu.org/ (accessed on 2016-08-01) (Association of Lisp Users). If you are its copyright owner, trademark owner, or designer, please let me know.

AI LISP Logo Sticker

Buy Lisp Logo Stickers

looks like people are selling it.

LISP Logo Latte Art

Lisp Alien Tech Logo

The Yinyang Lisp Logo

finally, discovered the origin of this lisp logo.

                         The ancient and
         and beautiful Chinese yin-yang symbol
      represents  complementary but  harmonious
   relationship  between the combinatory calculus
   and  the    lambda  calculus    Each  is    universal
    computationally but one has no variables while
       the  second    must    treat   bound   variables
          correctly. Their  representative    symbols
             relate  by    180   degrees  rotation,
                                 λ  and Y

illustration and commentary by Guy L  Steel  Jr

• The Little LISPer, 3rd Edition
• by Daniel P. Friedman, Matthias Felleisen
• 1989
• https://www.amazon.com/Little-LISPer-Third-Daniel-Friedman/dp/0023397632

thanks to jollyjack5856 comment on YouTube Xah Talk Show 2025-03-30 Ep637 Wolfram logo, lisp logo, python logo, why python sucks

• The Little LISPer 3rd ed., 1989, has this EXACT picture on its title page.
• Maybe earlier editions had it, too.
• So its a long-known symbol.
• and the “Little” book was extremely popular at one point, among LISPers.
• So it has the λ (lambda) and the Y symbols there (for Y combinator), intertwined, inside a circle.
• that's the idea.

• the book says “cover by Guy L. Steele”. then it has the full page with the explanation with text in the form of a circle, stating “illustration and commentary by Guy L.Steele, Jr.” He is the famous LISPer, one of authors of the book “Common Lisp the Language”.