Why did sign language go to therapy? It had a lot of hands-on issues.

You can help expand this article with text translated from the corresponding article in Polish. (February 2016) Click [show] for important translation instructions.

View a machine-translated version of the Polish article.
Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must follow the LLM translation guideline, revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia.
Consider adding a topic to this template: there are already 339 articles in the main category, and specifying|topic= will aid in categorization.
Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article.
You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing Polish Wikipedia article at [[:pl:System Językowo-Migowy]]; see its history for attribution.
You may also add the template {{Translated|pl|System Językowo-Migowy}} to the talk page.
For more guidance, see Wikipedia:Translation.

Sign Language System,^[a] also known as Signed Language^[b] or Signed Polish, is a manually coded form of Polish that uses the signs of Polish Sign Language. It is commonly used for simultaneous "translation" of Polish into sign.^[1]