"PS" meaning in Polish

{
  "head_templates": [
    {
      "args": {
        "1": "pl",
        "2": "phrase"
      },
      "expansion": "PS",
      "name": "head"
    }
  ],
  "hyphenation": [
    "P‧S"
  ],
  "lang": "Polish",
  "lang_code": "pl",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Polish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "post scriptum"
      ],
      "id": "en-PS-pl-phrase-9QmWut-6",
      "links": [
        [
          "post scriptum",
          "post scriptum"
        ]
      ],
      "synonyms": [
        {
          "word": "P.S."
        }
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈpɛˈɛs/"
    },
    {
      "rhymes": "-ɛɛs"
    }
  ],
  "word": "PS"
}

{
  "head_templates": [
    {
      "args": {
        "1": "pl",
        "2": "phrase"
      },
      "expansion": "PS",
      "name": "head"
    }
  ],
  "hyphenation": [
    "P‧S"
  ],
  "lang": "Polish",
  "lang_code": "pl",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        "Polish 2-syllable words",
        "Polish acronyms",
        "Polish entries with incorrect language header",
        "Polish lemmas",
        "Polish phrases",
        "Polish terms with IPA pronunciation",
        "Rhymes:Polish/ɛɛs",
        "Rhymes:Polish/ɛɛs/2 syllables"
      ],
      "glosses": [
        "post scriptum"
      ],
      "links": [
        [
          "post scriptum",
          "post scriptum"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈpɛˈɛs/"
    },
    {
      "rhymes": "-ɛɛs"
    }
  ],
  "synonyms": [
    {
      "word": "P.S."
    }
  ],
  "word": "PS"
}