"PREN" meaning in English

{
  "forms": [
    {
      "form": "PRENs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "PREN (plural PRENs)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "pitting resistance equivalent number"
        }
      ],
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        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2008, Hans Berns, Werner Theisen, translated by Gillian Scheibelein, Ferrous Materials: Steel and Cast Iron, Berlin, London: Springer, →ISBN, page 324:",
          "text": "Tungsten reinforces the effect of Mo, so that superduplex steel X2CrNiMoCuWN25-7-4 with 0.25% N, 0.8% W and 0.8% Cu reaches PREN > 40.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Acronym of pitting resistance equivalent number."
      ],
      "id": "en-PREN-en-noun-C2T-Apij",
      "links": [
        [
          "pitting resistance equivalent number",
          "pitting resistance equivalent number#English"
        ]
      ],
      "tags": [
        "abbreviation",
        "acronym",
        "alt-of"
      ]
    }
  ],
  "word": "PREN"
}

{
  "forms": [
    {
      "form": "PRENs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "PREN (plural PRENs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "pitting resistance equivalent number"
        }
      ],
      "categories": [
        "English acronyms",
        "English countable nouns",
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        "English lemmas",
        "English nouns",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "ref": "2008, Hans Berns, Werner Theisen, translated by Gillian Scheibelein, Ferrous Materials: Steel and Cast Iron, Berlin, London: Springer, →ISBN, page 324:",
          "text": "Tungsten reinforces the effect of Mo, so that superduplex steel X2CrNiMoCuWN25-7-4 with 0.25% N, 0.8% W and 0.8% Cu reaches PREN > 40.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Acronym of pitting resistance equivalent number."
      ],
      "links": [
        [
          "pitting resistance equivalent number",
          "pitting resistance equivalent number#English"
        ]
      ],
      "tags": [
        "abbreviation",
        "acronym",
        "alt-of"
      ]
    }
  ],
  "word": "PREN"
}