"segnasub" meaning in Italian

{
  "etymology_templates": [
    {
      "args": {
        "1": "segnare<t:to mark>",
        "2": "sub<t:scuba diver>"
      },
      "expansion": "Verb-object compound, composed of segna (“to mark”) + sub (“scuba diver”)",
      "name": "it-verb-obj"
    }
  ],
  "etymology_text": "Verb-object compound, composed of segna (“to mark”) + sub (“scuba diver”).",
  "head_templates": [
    {
      "args": {
        "1": "m",
        "2": "#"
      },
      "expansion": "segnasub m (invariable)",
      "name": "it-noun"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Italian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Italian links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Italian verb-object compounds",
          "parents": [
            "Verb-object compounds",
            "Compound terms",
            "Terms by etymology"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "surface marker buoy (marking a diver's position)"
      ],
      "id": "en-segnasub-it-noun-xtCn1Fvx",
      "links": [
        [
          "surface marker buoy",
          "surface marker buoy"
        ]
      ],
      "tags": [
        "invariable",
        "masculine"
      ]
    }
  ],
  "word": "segnasub"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "segnare<t:to mark>",
        "2": "sub<t:scuba diver>"
      },
      "expansion": "Verb-object compound, composed of segna (“to mark”) + sub (“scuba diver”)",
      "name": "it-verb-obj"
    }
  ],
  "etymology_text": "Verb-object compound, composed of segna (“to mark”) + sub (“scuba diver”).",
  "head_templates": [
    {
      "args": {
        "1": "m",
        "2": "#"
      },
      "expansion": "segnasub m (invariable)",
      "name": "it-noun"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Italian countable nouns",
        "Italian entries with incorrect language header",
        "Italian indeclinable nouns",
        "Italian lemmas",
        "Italian links with redundant wikilinks",
        "Italian masculine nouns",
        "Italian nouns",
        "Italian verb-object compounds",
        "Pages with 1 entry"
      ],
      "glosses": [
        "surface marker buoy (marking a diver's position)"
      ],
      "links": [
        [
          "surface marker buoy",
          "surface marker buoy"
        ]
      ],
      "tags": [
        "invariable",
        "masculine"
      ]
    }
  ],
  "word": "segnasub"
}