"pp" meaning in Translingual

{
  "head_templates": [
    {
      "args": {
        "1": "mul",
        "2": "adverb",
        "head": "pp"
      },
      "expansion": "pp",
      "name": "head"
    }
  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "adv",
  "senses": [
    {
      "glosses": [
        "pianissimo"
      ],
      "id": "en-pp-mul-adv-qA2CER9X",
      "links": [
        [
          "pianissimo",
          "pianissimo"
        ]
      ]
    },
    {
      "categories": [
        {
          "_dis": "31 69",
          "kind": "other",
          "name": "Musical symbols",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "8 92",
          "kind": "other",
          "name": "Translingual entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "per procurationem - Latin for by agency or by proxy - used on a letter to indicate that has been signed on somebody else's behalf."
      ],
      "id": "en-pp-mul-adv-5VGd9hEU",
      "links": [
        [
          "agency",
          "agency"
        ],
        [
          "proxy",
          "proxy"
        ]
      ]
    }
  ],
  "word": "pp"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English nouns",
    "English pluralia tantum",
    "English uncountable nouns",
    "English words without vowels",
    "Musical symbols",
    "Translingual adverbs",
    "Translingual entries with incorrect language header",
    "Translingual lemmas"
  ],
  "head_templates": [
    {
      "args": {
        "1": "mul",
        "2": "adverb",
        "head": "pp"
      },
      "expansion": "pp",
      "name": "head"
    }
  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "adv",
  "senses": [
    {
      "glosses": [
        "pianissimo"
      ],
      "links": [
        [
          "pianissimo",
          "pianissimo"
        ]
      ]
    },
    {
      "glosses": [
        "per procurationem - Latin for by agency or by proxy - used on a letter to indicate that has been signed on somebody else's behalf."
      ],
      "links": [
        [
          "agency",
          "agency"
        ],
        [
          "proxy",
          "proxy"
        ]
      ]
    }
  ],
  "word": "pp"
}