二
ニ, ジ, ふた, ふた.つ, ふたた.び, おと, つぐ, にい, は, ふ, ふたつ, ふだ, わ

two, two radical (no.2)

JLPT5 G1 S2 F9

Parallel lines indicating *two* and suggesting an alignment of supple objects, along with the abstract sense of ongoing affinity.

[Full Kanji Etymology List]