"system memory" meaning in English

{
  "etymology_text": ": system memory < → δείτε τις λέξεις system και memory",
  "forms": [
    {
      "form": "system memory"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Υλικό υπολογιστή (αγγλικά)",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "συνήθως αναφέρεται στην κεντρική μνήμη"
      ],
      "id": "el-system_memory-en-noun-BoVEW~yz",
      "raw_tags": [
        "υλικό υπολογιστή"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "main memory"
    }
  ],
  "word": "system memory"
}

{
  "etymology_text": ": system memory < → δείτε τις λέξεις system και memory",
  "forms": [
    {
      "form": "system memory"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Υλικό υπολογιστή (αγγλικά)"
      ],
      "glosses": [
        "συνήθως αναφέρεται στην κεντρική μνήμη"
      ],
      "raw_tags": [
        "υλικό υπολογιστή"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "main memory"
    }
  ],
  "word": "system memory"
}