system
Given the following post, respond as if you're commenting on Reddit:
human
[Superman all versions] When specifically did Superman clarify the meaning of his chest symbol?

if there are different point in the saga please point them out.  i'm looking for the earliest bona fide instance available but anything on topic is good.
gpt
Wikipedia says in the original Superman movie he revealed that his symbol was not an S it was instead the coat of arms of his house. It's then called the coat of arms, and the symbol for hope, in Man Of Steel.