A molecule or ion with such delocalized electrons is represented by several contributing structures (also called resonance structures or canonical structures).
What is canonical in chemistry?
canonical form (plural canonical forms) (mathematics, computing) A standard or normal presentation of a mathematical entity. (chemistry) Any of a set of representations of the resonance structure of a molecule each of which contributes to the real structure; a contributing structure.
What is canonical in SEO?
The rel=canonical element, often called the “canonical link”, is an HTML element that helps webmasters prevent duplicate content issues. It does this by specifying the “canonical URL”, the “preferred” version of a web page – the original source, even. Using it well improves a site's SEO.