← 2 3 4 →
-1 0 1 2 3 4 5 6 7 8 9 → List of numbers — Integers ← 0 10 20 30 40 50 60 70 80 90 →
Cardinal	three
Ordinal	3rd (third)
Numeral system	ternary
Factorization	prime
Divisors	1, 3
Greek numeral	Γ´
Roman numeral	III
Roman numeral (unicode)	Ⅲ, ⅲ
Greek prefix	tri-
Latin prefix	tre-/ter-
Binary	112
Ternary	103
Quaternary	34
Quinary	35
Senary	36
Octal	38
Duodecimal	312
Hexadecimal	316
Vigesimal	320
Base 36	336
Arabic	٣,3
Urdu
Bengali	৩
Chinese	三，弎，叁
Devanāgarī	३
Ge'ez	፫
Greek	γ (or Γ)
Hebrew	ג
Japanese	三
Khmer	៣
Korean	셋,삼
Malayalam	൩
Tamil	௩
Telugu	౩
Thai	๓

The number three (3) is one more than two and one less than four. It is the first Mersenne prime. Three is an important number for many cultures (groups of people living together). It is also a prime number. It is the first odd prime. In Roman numerals, it is III.

• the Three Stooges
• the three Doshas (weaknesses) in Ayurvedic medicine in India
• the Trimurti (three aspects of God) in Hindu religion
• the Holy Trinity in Christian religion
• three gifts of the wise men (Magi) who visited Christ at his birth in the Gospel of Matthew.
• the three bears in the fairy tale Goldilocks
• the three Imperial Regalia of Japan

This short article about mathematics can be made longer. You can help Wikipedia by adding to it.