What does PEN stand for?

Penetrating/Penetration

This definition appears very rarely and is found in the following Acronym Finder categories:

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Project Environmental Management Unit (Albania; World Bank) Pea Enation Mosaic Enamovirus Photo-Evoked Eyelid Microvibration (child neurology) Pan European Network (air traffic management) Parent Empowerment Network (Washington state) Partido Encuentro Nacional (Paraguay) Peer Education Network Penalty Penang, Malaysia - Penang International (Airport Code) Pendleton (Amtrak station code; Pendleton, OR)		Penitentiary Pennsylvania Environmental Network Permanent Employee Number Personal Education Number Persuasive, Expository, Narrative (basic styles of writing) Peruvian Nuevo Sol (Currency) Phoenix Entrepreneurs Network (Phoenix, AZ) Pilipino Educators Network (Maryland) Plain English Network (US government) Poder Ejecutivo Nacional (Argentina)