"SPD" meaning in Latin

{
  "categories": [
    {
      "kind": "other",
      "name": "Interjections en latin",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Lemmes en latin",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Sigles en latin",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Latin",
      "orig": "latin",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "(Sigle) Initiales de salutem plurimam dicit."
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "intj",
  "pos_title": "Interjection",
  "senses": [
    {
      "glosses": [
        "Formule de salutation utilisée au commencement des épîtres latines."
      ],
      "id": "fr-SPD-la-intj-N6RgYU6K"
    }
  ],
  "word": "SPD"
}

{
  "categories": [
    "Interjections en latin",
    "Lemmes en latin",
    "Sigles en latin",
    "latin"
  ],
  "etymology_texts": [
    "(Sigle) Initiales de salutem plurimam dicit."
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "intj",
  "pos_title": "Interjection",
  "senses": [
    {
      "glosses": [
        "Formule de salutation utilisée au commencement des épîtres latines."
      ]
    }
  ],
  "word": "SPD"
}