nns

Nns is an acronym that can refer to several distinct concepts depending on context. In written form it is sometimes capitalized as NNS, especially when used as a part-of-speech tag or an initialism for a project or organization. There is no single authoritative meaning for the term.

In linguistics, NNS is the standard Penn Treebank part-of-speech tag for plural common nouns, such as "cats" or "vehicles." The tagset also includes NN for singular nouns, NNP for singular proper nouns, and NNPS for plural proper nouns. The tag helps annotate corpora for parsing, tagging, and training language models.

In computing and artificial intelligence, NNS can refer to Neural Network Simulator or similar software projects. Such tools model artificial neural networks, enabling experimentation with architectures, learning algorithms, and data sets. The exact features depend on the specific software package, as there is no universal NNS standard across implementations.

Beyond these uses, NNS is employed as an initialism in various organizations, programs, and product names. Because it is a common sequence of letters, the intended reference is typically clarified by capitalization, full name, or accompanying context.