HAVELOCK

The Penn Treebank is a linguistic corpus developed at the University of Pennsylvania that established a standard taxonomy for tagging parts of speech in English text. Its tag set—including labels like NN (noun), VB (verb), JJ (adjective), and RB (adverb)—has become the foundation for natural language processing research and computational linguistics. Understanding the grammatical architecture of text reveals patterns invisible to casual reading: the density of nouns versus verbs, the rhythm of adjectives, the scaffolding of prepositions that hold meaning together.