what is tcn(Truncated Compact Notation)?

I have few questions about Truncated Compact Notation and searching for tcn does not produce any results in the forums.

1. Does chess.com provide any documentation for tcn?
2. Does a character in tcn has a associated move in PGN? For example, C is e2 is there a a character that says exd5?

Thank you

Here is a github repo that encode and decode it:
https://github.com/savi2w/chess-tcn

search github, you'll find many, with explanations

https://www.chess.com/clubs/forum/view/official-chess-com-movelist-pgn-help

Thank you Issaharw and Ximoon!