S-tier - What does S-tier mean?

S-tier is slang for "Top rank." See an example of how people use it.
An item that is S-tier is among the best of the best in its class. This label is thought to have originated from Japan's school grading system, but it was popularized by Japanese-developed video games.

So I saw Col's new tier list video and I mean at least he got something right.

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Why Does S Come Before A in Video Game Rankings?

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