亘, a compound ideographic character of whirling water, serves as phonetic component to form characters.
In modern Chinese 亘 means: extend across, through; from.
Characters formed by the phonetic component 亘
烜 晅 xuǎn xuǎn
恒 姮 héng héng
桓 洹 荁 貆 峘 狟 huán huán huán huán huán huán
暅 垣 刯 gèng yuán gēng