"PJO" meaning in English

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  "lang_code": "en",
  "pos": "name",
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          "word": "Percy Jackson & the Olympians"
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      "related": [
        {
          "word": "Percabeth"
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        "PJO",
        "Percy Jackson",
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  "word": "PJO"
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  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "related": [
    {
      "word": "Percabeth"
    }
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          "word": "Percy Jackson & the Olympians"
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        "en:Fictional characters"
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  "word": "PJO"
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