"iso" meaning in Gaulois

{
  "categories": [
    {
      "kind": "other",
      "name": "Mots attestés en gaulois",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Pronoms démonstratifs en gaulois",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Gaulois",
      "orig": "gaulois",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Mot attesté dans une formule de Marcellus de Bordeaux et sur la tablette de Chamalières^([1])^([2]).",
    "Comparable au lépontique 𐌉𐌑𐌏𐌔 (išos) et au latin iste."
  ],
  "lang": "Gaulois",
  "lang_code": "gaulois",
  "pos": "pron",
  "pos_title": "Pronom démonstratif",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Mots en gaulois de sens incertain",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Cela, ce."
      ],
      "id": "fr-iso-gaulois-pron-NkkK1kdG",
      "raw_tags": [
        "Sens incertain"
      ]
    }
  ],
  "tags": [
    "demonstrative"
  ],
  "word": "iso"
}

{
  "categories": [
    "Mots attestés en gaulois",
    "Pronoms démonstratifs en gaulois",
    "gaulois"
  ],
  "etymology_texts": [
    "Mot attesté dans une formule de Marcellus de Bordeaux et sur la tablette de Chamalières^([1])^([2]).",
    "Comparable au lépontique 𐌉𐌑𐌏𐌔 (išos) et au latin iste."
  ],
  "lang": "Gaulois",
  "lang_code": "gaulois",
  "pos": "pron",
  "pos_title": "Pronom démonstratif",
  "senses": [
    {
      "categories": [
        "Mots en gaulois de sens incertain"
      ],
      "glosses": [
        "Cela, ce."
      ],
      "raw_tags": [
        "Sens incertain"
      ]
    }
  ],
  "tags": [
    "demonstrative"
  ],
  "word": "iso"
}