The blog post explains that choosing between the English indefinite articles “a” and “an” depends on the initial sound of the spoken word rather than the first letter of the written word—for instance, “a unicorn” versus “an hour.” The author analyzed a dataset of 32,455 words to identify exceptions and created visualizations, finding that only 129 words required special handling when programmatically determining which article to use for procedural text generation.
https://www.redblobgames.com/blog/2026-09-16-english-a-vs-an/