This is the 7302nd most frequent Russian word.
высокая
"Высокая" means "high" or "tall" in English.
Here, 'высокая' is used as an adjective describing the height of the mountain, indicating it is tall or elevated.
Эта гора очень высокая.
This mountain is very high.
In this sentence, 'высокая' describes the level of self-esteem, using it metaphorically to indicate a high level of personal valuation.
У неё высокая самооценка.
She has a high self-esteem.
Here, 'высокая' refers to the advanced level of mathematics, denoting its complexity and sophistication.