Meaning
二 means two. Inherited directly from classical Chinese script, it is one of the oldest characters in the Japanese writing system. Both languages use it for the quantity two, making it instantly readable across East Asian scripts.
Structurally, 二 is an ideograph: its visual form encodes its meaning directly. Ancient scribes drew two horizontal strokes to represent two units — much like tally marks scratched into clay. The upper stroke is slightly shorter than the lower, giving the character a clean, balanced look. The same logic runs through 一 (one) and 三 (three), forming a natural visual sequence for the first three counting numbers.
Written in just 2 strokes, 二 is taught in Grade 1 of Japanese elementary school. It also serves as its own radical (部首). Since it appears constantly — in numbers, dates, times, and compound words — it is one of the first kanji worth knowing cold.
Past pure counting, 二 carries the nuances of duality and secondary order. Naming the second floor, the 2nd of the month, a second attempt — it turns up throughout daily Japanese.
Readings
On'yomi (音読み) — Chinese-derived readings
The on'yomi readings are ニ and ジ, both from classical Chinese. They appear mainly in compound words (熟語, jukugo).
ニ (ni) is the standard on'yomi, used in the vast majority of compounds and counting contexts.
- 二月 (nigatsu) — February (literally "second month")
- 二階 (nikai) — second floor
- 二十 (nijuu) — twenty
ジ (ji) is rare and survives mainly in archaic or formal vocabulary. You will not encounter it often in daily conversation.
- 二位 (jii) — second place, second rank (archaic/formal)
Kun'yomi (訓読み) — Native Japanese readings
The kun'yomi readings are ふた (futa), ふたつ (futatsu), and ふたたび (futatabi) — all native Japanese words for "two."
ふた (futa) acts as a prefix in native words expressing pairs or the concept of two.
- 二人 (futari) — two people
- 二つ (futatsu) — two things (general counter)
ふたつ (futatsu) is the native counter for two objects. It belongs to the -tsu series (ひとつ、ふたつ、みっつ…), which counts general objects from one to ten.
- リンゴが二つある。 — There are two apples.
ふたたび (futatabi) means "again" or "once more," literally "a second time." Slightly literary in register compared to the everyday もう一度 (mou ichido).
- 再び (futatabi) — again (literary)
Common Words & Compounds
Key compounds grouped by theme.
Numbers & Counting
- 二 (ni) — two (basic numeral)
- 二つ (futatsu) — two things (native counter)
- 二人 (futari) — two people
- 二十 (nijuu) — twenty
- 二百 (nihyaku) — two hundred
Time & Calendar
- 二月 (nigatsu) — February
- 二日 (futsuka) — the 2nd day of the month; two days
- 二時 (niji) — two o'clock
- 二週間 (ni shuukan) — two weeks
Places & Spatial
- 二階 (nikai) — second floor
- 二番目 (nibanme) — the second (in order)
Expressions & Set Phrases
- 二度 (nido) — twice; two times
- 二度と (nido to) — never again (with negative verb)
- 再び (futatabi) — again, once more
- 二分 (nibun) — halved; divided in two
Example Sentences
二は一と三の間にある数です。
Ni wa ichi to san no aida ni aru kazu desu.
Two is the number between one and three.
二月は一年で一番短い月です。
Nigatsu wa ichinen de ichiban mijikai tsuki desu.
February is the shortest month of the year.
この建物は二階建てです。
Kono tatemono wa nikai-date desu.
This building has two floors.
私には二人の兄弟がいます。
Watashi ni wa futari no kyoudai ga imasu.
I have two siblings.
二日に友達と会う約束があります。
Futsuka ni tomodachi to au yakusoku ga arimasu.
I have plans to meet a friend on the 2nd.
この問題は二通りの答えがあります。
Kono mondai wa futatoori no kotae ga arimasu.
This problem has two possible answers.
二度と同じ間違いをしないようにしましょう。
Nido to onaji machigai wo shinai you ni shimashou.
Let's make sure not to make the same mistake again.
再び会える日を楽しみにしています。
Futatabi aeru hi wo tanoshimi ni shite imasu.
I look forward to the day we can meet again.
試験まで二週間しかありません。
Shiken made ni shuukan shika arimasen.
There are only two weeks left until the exam.
Related Kanji
- 九 — Nine (Kanji N5)
- 一 — One (Kanji N5)
- 気 — Spirit, Energy, Air (Kanji N5)
- 百 — Hundred (Kanji N5)
- 六 — Six (Kanji N5)
- 三 — Three (Kanji N5)
Memory Tip
The character is its own mnemonic: two horizontal lines, two units. The same logic works for 一 (one) and 三 (three), so learning all three at once makes sense. For the reading, tie に (ni) to the English sound "knee" — picture two knees side by side. For 二人 (futari), think "futa = future" and picture two friends sharing one.
Vietnamese learners have a direct shortcut: the Hán-Việt reading NHỊ connects immediately to familiar words — nhị phân (binary), đệ nhị (second/secondary), nhị ca — all built on the same root as this kanji.