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While Protein-Energy Malnutrition (PEM) contributes to approximately 45% of child deaths annually in developing nations, the acronym is not limited to medicine. Understanding the context is crucial to decoding the correct PEM meaning, which also refers to file types in cybersecurity, a technology in clean energy, and a type of fastener in manufacturing.

While many acronyms have a single, widely recognized meaning, PEM is an exception, with its definition changing dramatically depending on the context. This makes understanding what is PEM short for a complex task, requiring an overview of various fields, including medicine, technology, and science.