number one; top-ranked; the best
Katakana noun for the top position or the best person or thing in a group, ranking, sales category, field, etc. Common in everyday speech, sports, business, advertising, and rankings.
He is the team's number one.
This product became number one in sales.
He became the top salesperson in the company.
This team is aiming to be number one in the national tournament.
That company boasts the top market share in the industry.