ANSI is the American National Standards Institute, the standards setting body in the United States. For the purposes of CLiki, ANSI refers to ANSI INCITS 226-1994 (R2004) (formerly X3.226-1994 (R1999)), the Common Lisp standards document. The document itself may be purchased at the ANSI eStandards store, but in practice the Hyperspec is used as the canonical standards document for Common Lisp.