The World of Null-A, sometimes written The World of Ā, is a 1948 science fiction novel by A. E. van Vogt.
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The combination of Star Trek syndicated re-runs (the original 1966 series) and A. E. van Vogt's Destination: Universe! made a profound impact.
The volumes also contain individual author biographies; authors covered include James H. Schmitz, Jack Williamson, E. C. Tubb, A. E. van Vogt, and Charles L. Harness.
According to the biography printed in many of his books, his influences include the science-fiction writers Isaac Asimov, A. E. van Vogt, Poul Anderson and Philip José Farmer and the crime writers Rex Stout and Andrea Camilleri.
The xill is inspired by the ixtl, a devil-like alien from the science fiction novel The Voyage of the Space Beagle by A. E. van Vogt.