"llum posterior" meaning in Catalan

{
  "forms": [
    {
      "form": "llums posteriors",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "llum posterior m (plural llums posteriors)",
      "name": "ca-noun"
    }
  ],
  "lang": "Catalan",
  "lang_code": "ca",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Catalan entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "ca",
          "name": "Auto parts",
          "orig": "ca:Auto parts",
          "parents": [
            "Automobiles",
            "Automotive",
            "Vehicles",
            "Transport",
            "Machines",
            "All topics",
            "Technology",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "ca",
          "name": "Light sources",
          "orig": "ca:Light sources",
          "parents": [
            "Light",
            "Energy",
            "Nature",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "tail light"
      ],
      "id": "en-llum_posterior-ca-noun-LHLwh1Fv",
      "links": [
        [
          "tail light",
          "tail light"
        ]
      ],
      "synonyms": [
        {
          "word": "llum de darrere"
        }
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "word": "llum posterior"
}

{
  "forms": [
    {
      "form": "llums posteriors",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "llum posterior m (plural llums posteriors)",
      "name": "ca-noun"
    }
  ],
  "lang": "Catalan",
  "lang_code": "ca",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Catalan countable nouns",
        "Catalan entries with incorrect language header",
        "Catalan lemmas",
        "Catalan masculine nouns",
        "Catalan multiword terms",
        "Catalan nouns",
        "Catalan nouns with red links in their headword lines",
        "Pages with 1 entry",
        "Pages with entries",
        "ca:Auto parts",
        "ca:Light sources"
      ],
      "glosses": [
        "tail light"
      ],
      "links": [
        [
          "tail light",
          "tail light"
        ]
      ],
      "synonyms": [
        {
          "word": "llum de darrere"
        }
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "word": "llum posterior"
}