Meaning
弐 is the formal, tamper-resistant variant of the common kanji 二, both meaning "two." Known as a daiji (大字 — formal numeral), 弐 was created to protect financial and legal documents from fraud. The problem with 二 is structural: just two horizontal strokes, trivially easy to alter. Add one more line and 二 becomes 三 (three). The more complex 弐 was adopted as the official alternative — its elaborate form making falsification far harder.
The practice of using complex numerals for security originated in ancient China and reached Japan centuries ago. Today, 弐 appears on checks, contracts, official receipts, deeds, and government documents — any legally binding paperwork where the numeral 2 must be recorded with precision. Outside these formal contexts, you will essentially never encounter it.
Structurally, 弐 is written with 6 strokes and built around the radical 弋 (ほこ/よく — meaning "stake" or "dart"), giving it a visual complexity that immediately sets it apart from the plain 二. It belongs to the Jōyō kanji list at grade 8, placing it in advanced adult literacy rather than elementary school. JLPT N1 reflects this specialized nature. The Hán-Việt (Sino-Vietnamese) reading is NHỊ — the same root as the Vietnamese word nhị, a direct trace of the Sino-character heritage running through East Asian writing systems. Chinese learners will recognize the equivalent formal numerals: 貳 (traditional) or 贰 (simplified).
Readings
On'yomi (音読み) — Chinese-derived readings
弐 carries a single on'yomi reading: ニ (NI). Borrowed from the ancient Chinese pronunciation of "two," this is the only reading that matters in practice. In all formal documents, monetary notations, and official designations, 弐 is read exactly as the common 二 would be.
- 弐万円 (niman-en) — Twenty thousand yen (formal monetary notation)
- 弐千円 (nisen-en) — Two thousand yen (formal monetary notation)
- 弐号 (nigō) — Unit Two, Number Two (formal unit designation)
When reading 弐 aloud — say, when a bank teller reads out a check amount, or a lawyer cites an article in a contract — the pronunciation is simply ニ, identical to the everyday kanji 二. The written form changes; the spoken word does not. 弐 is a visual security device with the same spoken value as 二.
Kun'yomi (訓読み) — Native Japanese readings
The theoretical kun'yomi associated with 弐 is ふた (futa), the native Japanese root word for "two," also seen in 二つ (futatsu — two things) and 二人 (futari — two people). In practice, this reading is essentially never used with 弐. The formal daiji exists exclusively in Sino-Japanese (on'yomi) territory; native Japanese counting expressions always use the plain 二, not 弐.
- 弐つ (futatsu) — Two things (archaic or theoretical; standard form uses 二つ)
In practice, 弐 has one reading worth knowing: ニ (NI). The kun'yomi is a linguistic technicality that won't appear in any real document or examination. Recognize 弐 in formal written material, know its relationship to 二, and that covers it.
Common Words & Compounds
Because 弐 is a specialized formal numeral, its compounds cluster in official, financial, and legal language. They appear in Japanese legal documents, bank paperwork, and historical texts — anywhere numbers need to be tamper-proof.
Formal Monetary Amounts
- 金弐円 (kin ni-en) — Two yen (formal monetary amount notation)
- 弐拾円 (nijū-en) — Twenty yen (formal)
- 弐百円 (nihyaku-en) — Two hundred yen (formal)
- 弐千円 (nisen-en) — Two thousand yen (formal)
- 弐万円 (niman-en) — Twenty thousand yen (formal)
- 弐百万円 (nihyakuman-en) — Two million yen (formal)
Formal Ordinal and Unit Designations
- 弐番 (niban) — Number two, second position (formal ordinal)
- 弐号 (nigō) — Unit Two, Model Two (formal official designation)
- 弐段 (nidan) — Second rank (used in martial arts certificates and formal rank documents)
- 弐冊 (nisatsu) — Two volumes (formal document count)
- 弐枚 (nimai) — Two sheets (formal count of flat objects)
Legal Document Contexts
- 第弐条 (dai-ni-jō) — Article Two (in a formal legal instrument)
- 弐部 (nibu) — Two copies (official document count)
- 金弐千円也 (kin nisen-en nari) — The sum of two thousand yen (classic formal receipt formula)
Example Sentences
この小切手には金弐万円と記入されている。
Kono kogitte ni wa kin niman-en to kinyū sarete iru.
This check is made out for twenty thousand yen in formal notation.
領収書には金弐千円也と書いてあった。
Ryōshūsho ni wa kin nisen-en nari to kaite atta.
The receipt had "the sum of two thousand yen" written in formal notation.
改ざん防止のために、正式な文書では弐という字を使う。
Kaizan bōshi no tame ni, seishiki na bunsho de wa ni to iu ji wo tsukau.
To prevent falsification, formal documents use the character 弐.
契約書には金弐百万円と明記する必要がある。
Keiyakusho ni wa kin nihyakuman-en to meiki suru hitsuyō ga aru.
The contract must specify two million yen in formal notation.
古い文書には弐の字が頻繁に使われている。
Furui monjo ni wa ni no ji ga hinpan ni tsukawarete iru.
The character 弐 is frequently used in old historical documents.
弐号機が無事に起動した。
Nigōki ga buji ni kidō shita.
Unit Two has been successfully activated.
この道場では弐段を取得するのに数年かかる。
Kono dōjō de wa nidan wo shutoku suru no ni sūnen kakaru.
At this dojo, it takes several years to attain second rank.
銀行の窓口で、弐万円の振込を依頼した。
Ginkō no madoguchi de, niman-en no furikomi wo irai shita.
I requested a transfer of twenty thousand yen at the bank counter.
日本の伝統では、壱・弐・参などの大字は公式書類に欠かせない。
Nihon no dentō de wa, ichi, ni, san nado no daiji wa kōshiki shorui ni kakasenai.
In Japanese tradition, formal numerals such as 壱, 弐, and 参 are indispensable in official documents.
Memory Tip
Think of 弐 as the "armored bodyguard" version of 二. The plain 二 — just two horizontal lines — is dangerously easy to forge: add a stroke and it becomes 三 (three). So 弐 was given extra strokes, like a suit of armor, to make tampering impossible. Picture a number two in heavy protective gear, standing guard over a stack of official bank documents.
The radical 弋 inside 弐 resembles a dart or stake — as if the number two has been physically staked to the ground, locked in place and unable to be changed. "Two, pinned down and protected" captures both the visual structure and the entire purpose of this character. Spot 弐 on any document and you are reading a fraud-prevention tool unchanged for centuries.