二

Nichiku (the two former provinces of Chikuzen and Chikugo)

Biology

diploid (organism, cell, etc.); diplont

two-toed sloth (Choloepus sp.)

Shinto

the Twenty-Two Shrines; the 22 most important Shinto shrines, as designated during the Heian period

nitrogen dioxide

Mathematics

binomial theorem

Computing

binary operator

biracial

after two outs

double glazing

double collision

Botany

biennial; biennial plant

carbon disulfide

Mathematics

binomial coefficient

staff sergeant

Mathematics

square root

Military

technical sergeant (JASDF)

twin lens reflex camera

second cousin

secondary forest; second-growth forest

Idiomatic expression

to be engaged in two trades at the same time; to have two irons in the fire; to wear two pairs of straw sandals

Proverb

two is a company, three is a crowd; one companion is better than two

Organization name

Nishogakusha University

double cocoon