noun
highest value; maximum value; peak price
Used in financial, statistical, or general contexts to refer to the highest recorded value, such as a stock price, temperature, or score.
この株は今日、最高値を更新した。
This stock hit a new high today.
気温の最高値は35度だった。
The maximum temperature was 35 degrees.
最高 is a more general adjective/noun meaning 'the best' or 'wonderful', while 最高値 specifically refers to a numerical maximum.
Compound of 最高 (highest) + 値 (value).