Jinmeiyō kanji, used in names
Stroke count: 12
Meaning: one, single, simple
Kunyomi: ひとえ
Onyomi: タン
Radical: 口
Meaning: mouth, opening
単細胞 (タンサイボウ) single cell, simple-minded person, one-track-minded person
單槍匹馬 (タンソウヒツバ) doing something on one's own without another's help
菜単 (サイタン) menu (at a Chinese restaurant)