The main source people are using is a declassified FBI document.
Heres the wiki:
https://wikileaks.org/wiki/FBI_pedophile_symbols
Then given the cryptic nature of the emails and other social media that seemingly contain this language or code not part of the story? Shouldn’t the debunking have explanations for this? Shouldn’t part of the “fake news causes harm” narrative at least state and show how people came to these positions?