title_body: What notation do constructed sign languages use?
upvoted_answer: There are very few constructed sign languages. On the subreddit, we sometimes get questions about whether anyone has made any, which usually don’t get many replies. This one here has some examples given, and also links a website which has basically the answer to your actual question: 
  
  SLIPA is an attempt by David Peterson to fill the lack of sign language transcription systems. However, due to it being ASCII-compliant, it ends up rather unweildy and I’ve never seen it employed in actuality. Nevertheless, the website provides important information that could be useful for you to derive your own system tailored to your language, and to use as a reference for comparing your own notation to.