"iu" meaning in Gaulois

{
  "categories": [
    {
      "kind": "other",
      "name": "Abréviations en gaulois",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Mots attestés en gaulois",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Noms communs en gaulois",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Gaulois",
      "orig": "gaulois",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "(Abréviation) Mot attesté dans le calendrier de Coligny^([1])^([2])."
  ],
  "lang": "Gaulois",
  "lang_code": "gaulois",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "glosses": [
        "Abréviation de iuos."
      ],
      "id": "fr-iu-gaulois-noun-YmyYAXmF"
    }
  ],
  "word": "iu"
}

{
  "categories": [
    "Abréviations en gaulois",
    "Mots attestés en gaulois",
    "Noms communs en gaulois",
    "gaulois"
  ],
  "etymology_texts": [
    "(Abréviation) Mot attesté dans le calendrier de Coligny^([1])^([2])."
  ],
  "lang": "Gaulois",
  "lang_code": "gaulois",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "glosses": [
        "Abréviation de iuos."
      ]
    }
  ],
  "word": "iu"
}