You may be looking for:
- Wikipedia:Article titles § Deciding on an article title (WP:CONSISTENT), describing the consistency criterion in article titling policy
- Wikipedia:Consistency in article titles (WP:TITLECON), explanatory supplement to the above policy page, on naming articles along consistent patterns, especially within a category
- Wikipedia:Manual of Style § Consistency within articles (MOS:ARTCON), on using a consistent variety of English within an article
- Wikipedia:Manual of Style § US and U.S. (MOS:US), on using consistent country abbreviations within an article
- Wikipedia:Manual of Style/Dates and numbers § Retaining existing format (MOS:DATEVAR), on using a consistent date format within an article
- Wikipedia:Citing sources § Variation in citation methods (WP:CITEVAR), on using a consistent citation format within an article
See also
- Wikipedia:Emerson and Wilde on consistency, an essay on the misuse of famous writers' fragmentary quotations about consistency
- Wikipedia:Consistency proposal, a failed 2006 proposal for a consistency guideline for facts in articles (formerly at Wikipedia:Consistency)