Developing a Source-Verified Dictionary of Nihilistic Violent Extremism: Methods, Taxonomy, Contextual Boundaries, and Research Implications

Nihilistic violent extremism (NVE) is a contested label used by United States and European authorities to describe online networks, most prominently 764 and the wider Com ecosystem, that combine child sexual exploitation, coerced self-harm, cybercrime, and the glorification of violence. Practitioners who encounter this ecosystem indirectly need a shared, verifiable vocabulary, yet relevant terminology is dispersed across advisories, charging documents, glossaries, and emerging scholarship, while ad hoc keyword lists invite serious false positives. This article reports the development of the NVE Dictionary, Version 1, a source-verified reference containing 153 entries derived from 29 registered official, research-organisation, and peer-reviewed sources through a twelve-lane structured documentary search, with evidence reviewed through 27 August 2026. The article describes the search design, term inclusion and exclusion rules, a four-level verification-tier system (A, B, C, and X), the ten-category taxonomy used to organise the corpus, and the complete audit-trail instrument set. A secondary classification found that only 27 of 146 substantive entries (18.5%) were coinages native to the ecosystem; equal shares were borrowed from adjacent extremist milieus and general vocabularies, while 44.5% were institutional or analytic descriptors. Among 81 documented vocabulary items, 70.4% had lexically generic surface forms, and no authoritative public emoji decoder could be verified. These findings explain structurally why isolated-marker identification produces false positives and why the instrument enforces behavior-first interpretation, explicit contextual boundaries, and dated re-verification. The article concludes with a staged agenda for independent validation, content review, reliability testing, and practical usability assessment across research and professional settings.The full NVE Dictionary is available at Landress, H. N. (2026, August 28). NVE Dictionary. Zenodo. https://doi.org/10.5281/zenodo.22136966