Tiddler

A tiddler is a term with several senses in English and in computing. In everyday language, a tiddler is a small or young fish; the word is also used figuratively for something small or insignificant. The term is common in British English and can describe a minor detail or a trivial matter.

In computing and digital wikis, a tiddler is the fundamental unit of content in TiddlyWiki. Each tiddler has a title and body text, and may carry metadata such as tags and creation or modification dates. Tiddlers are stored together in a wiki store and can be edited, linked, tagged, exported, or synchronized. The concept emphasizes modular, portable pieces of information that users can rearrange and remix.

In literature and popular culture, "Tiddler" is the title of a children's picture book by Julia Donaldson and Axel Scheffler. The story follows a small fish who navigates the sea, a tale often cited as an approachable marine narrative for children.

The word is also encountered in educational and fisheries contexts to refer to juvenile fish, particularly when discussing population dynamics or hobbyist observations. Overall, the term tiddler serves as a flexible label for smallness, whether describing marine life, compact information units, or cultural works.