"l-" meaning in Translingual

{
  "head_templates": [
    {
      "args": {
        "1": "mul",
        "2": "prefix"
      },
      "expansion": "l-",
      "name": "head"
    }
  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English links with manual fragments",
          "parents": [
            "Links with manual fragments",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Translingual entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "mul",
          "name": "Chemistry",
          "orig": "mul:Chemistry",
          "parents": [
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "deprecated notation for levorotatory (versus modern notation, (−))."
      ],
      "id": "en-l--mul-prefix-mDRpWcdO",
      "links": [
        [
          "chemistry",
          "chemistry"
        ],
        [
          "deprecated",
          "deprecated#Adjective"
        ],
        [
          "levorotatory",
          "levorotatory#Adjective"
        ]
      ],
      "raw_glosses": [
        "(chemistry) deprecated notation for levorotatory (versus modern notation, (−))."
      ],
      "tags": [
        "morpheme"
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "word": "l-"
}

{
  "head_templates": [
    {
      "args": {
        "1": "mul",
        "2": "prefix"
      },
      "expansion": "l-",
      "name": "head"
    }
  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        "English links with manual fragments",
        "Translingual entries with incorrect language header",
        "Translingual lemmas",
        "Translingual prefixes",
        "mul:Chemistry"
      ],
      "glosses": [
        "deprecated notation for levorotatory (versus modern notation, (−))."
      ],
      "links": [
        [
          "chemistry",
          "chemistry"
        ],
        [
          "deprecated",
          "deprecated#Adjective"
        ],
        [
          "levorotatory",
          "levorotatory#Adjective"
        ]
      ],
      "raw_glosses": [
        "(chemistry) deprecated notation for levorotatory (versus modern notation, (−))."
      ],
      "tags": [
        "morpheme"
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "word": "l-"
}