Double letter

It has been suggested that this article be merged into Gemination. (Discuss) Proposed since April 2025.

This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these messages) The topic of this article may not meet Wikipedia's general notability guideline. Please help to demonstrate the notability of the topic by citing reliable secondary sources that are independent of the topic and provide significant coverage of it beyond a mere trivial mention. If notability cannot be shown, the article is likely to be merged, redirected, or deleted. Find sources: "Double letter" – news · newspapers · books · scholar · JSTOR (April 2025) (Learn how and when to remove this message) This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Double letter" – news · newspapers · books · scholar · JSTOR (April 2025) (Learn how and when to remove this message) (Learn how and when to remove this message)

In orthography, a double letter, doubled letter, or double writing, etc, refers to writing the same letter twice in a row.

The opposite is single letter (etc).