Content node is short for knowledge content node, a term from the KN^3 movement. Content nodes can be web pages, sites, apps, articles, or anything that contains knowledge content source, which is primarily writing and images.
A content node can be as small as a single concept definition or as large as a multi-part article.
When a bunch of content nodes are bundled together I call it a content node cluster.
[If these terms seem similar to neural biology that’s because that is what they are based on. A content node can roughly be compared to a single neuron. Some are bigger than others, but all are best when networked and connected with others.]