弐 means “two (formal)”

に · ni

Also: II, two, second

Kun'yomi (Japanese reading)
ふたつ, そえ
On'yomi (Chinese reading)
ニ, ジ

JLPT N1 · Taught in secondary school · 6 strokes

The story

Two (二) fenced in by a stake (弋): the formal two, built so no one can slip in an extra stroke. 弐 turns up in contracts and on the two-thousand-yen note, printed 弐千円 and seldom seen outside Okinawa.

Used in 弐 (ni, two, in formal documents) and 弐千円 (nisen'en, two thousand yen)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.