What does the 52-week high mean in the financial world?

52-week high

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Example:

1.

Skeptics also pointed out that it is not surprising that the stock market hit a 52-week high after a sharp drop a year ago.

Sceptics also pointed out that it is not surprising that various stocks hit 52-week highs, because the stock market fell so deeply a year ago.

2.

He said that it may take a year for the index to peak even after weak stocks start to fall and the proportion of stocks that hit a 52-week high begins to decline.

He said that even if weaker stocks have started to fall, the proportion of stocks that have reached a 52-week high has declined, and it may take a year for the index to peak.