pinyin: yǐ, the second of the ten Heavenly Stems

Chinese phrase: 乙等 yǐ děng - the second level

Examples:
艺
pinyin: yì
Chinese phrase: 艺术 yì shù - art
手艺 shǒu yì - craftsmanship

忆
pinyin: yì
Chinese phrase: 回忆 huí yì - recall, recollect
记忆 jì yì - remember, memory

亿
pinyin: yì
Chinese phrase: 一亿 yī yì - a hundred million