"θ-pinch" meaning in English

{
  "forms": [
    {
      "form": "θ-pinches",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "θ-pinch (plural θ-pinches)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "theta pinch"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
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          "source": "w"
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          "source": "w"
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Electromagnetism",
          "orig": "en:Electromagnetism",
          "parents": [
            "Physics",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Nuclear fusion",
          "orig": "en:Nuclear fusion",
          "parents": [
            "Nuclear energy",
            "Energy",
            "Nuclear physics",
            "Technology",
            "Nature",
            "Physics",
            "Quantum mechanics",
            "All topics",
            "Sciences",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Alternative form of theta pinch"
      ],
      "id": "en-θ-pinch-en-noun-0XzMKj8l",
      "links": [
        [
          "theta pinch",
          "theta pinch#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
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    }
  ],
  "word": "θ-pinch"
}

{
  "forms": [
    {
      "form": "θ-pinches",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "θ-pinch (plural θ-pinches)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "theta pinch"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms spelled with Θ",
        "English terms written in multiple scripts",
        "en:Electromagnetism",
        "en:Nuclear fusion"
      ],
      "glosses": [
        "Alternative form of theta pinch"
      ],
      "links": [
        [
          "theta pinch",
          "theta pinch#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
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    }
  ],
  "word": "θ-pinch"
}