What does the c @@ line mean in Git logs?

Question

git

Nowhere can I find information on how to understand this line in Git

For example

@@ -0.0 +1.12 @@

And what do the green squares mean in GitHub

Answer 1

https://ru.m.wikipedia.org/wiki/Diff
Section Universal Format

Answer 2

What does the c @@ line mean in Git logs?

Number of deletions and number of insertions.

And what do the green squares mean in GitHub

Same.