tóu​hào HSK7

number one

头号 (頭號) tóu​hào
number one adjective
the foremost or most prominent in a category, often regarding importance or notoriety

He is the number one most wanted criminal the police have been hunting for years.

top-rank adjective
belonging to the highest grade, size, or quality

These extra-large apples are very popular in the market.

Frequency

Movie subtitles
10.2 per million appears in 4% of films
Written text
9.19 per million

Details

HSK 3.0
Level 7

Sources

Definitions
CC-CEDICT