This is the 438th most frequent Vietnamese word.
tỉ
The Vietnamese word "tỉ" can mean "ratio," "proportion," or is used as an informal term for "older sister."
Tỉ in this sentence refers to 'billion', denoting a very large quantity.
Tỉ phú này đã đóng góp rất nhiều cho quỹ từ thiện.
This billionaire has contributed greatly to the charity fund.
Tỉ here is used to describe a number in the billions range, typically in financial or numerical contexts.
Kết quả trận đấu là 3 tỉ 2.
The match result is 3 billion 2.
Tỉ lệ in this sentence implies 'rate/ratio' used in statistics or proportions.