"ⱉ" meaning in Vieux slave

{
  "categories": [
    {
      "kind": "other",
      "name": "Lettres en vieux slave",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Vieux slave",
      "orig": "vieux slave",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Vieux slave",
  "lang_code": "cu",
  "pos": "character",
  "pos_title": "Lettre",
  "raw_tags": [
    "o"
  ],
  "senses": [
    {
      "glosses": [
        "O-te, vingt-cinquième lettre et septième voyelle de l’alphabet glagolitique (minuscule)."
      ],
      "id": "fr-ⱉ-cu-character-BKJBykNt"
    }
  ],
  "sounds": [
    {
      "ipa": "*\\ɔ\\"
    }
  ],
  "tags": [
    "letter"
  ],
  "word": "ⱉ"
}

{
  "categories": [
    "Lettres en vieux slave",
    "vieux slave"
  ],
  "lang": "Vieux slave",
  "lang_code": "cu",
  "pos": "character",
  "pos_title": "Lettre",
  "raw_tags": [
    "o"
  ],
  "senses": [
    {
      "glosses": [
        "O-te, vingt-cinquième lettre et septième voyelle de l’alphabet glagolitique (minuscule)."
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "*\\ɔ\\"
    }
  ],
  "tags": [
    "letter"
  ],
  "word": "ⱉ"
}