秭
zǐ

one thousand millions

Senses

秭 zǐ ten to the power of nine or twelve

(bound form) an ancient numerical unit; varying definitions include one billion ($10^9$), one trillion ($10^{12}$), or even higher powers of ten

秭 zǐ (place name)

(bound form) used in the place name 秭归 zǐ​guī, a county in Hubei province

References

see 秭/秭 → 秭归/秭歸