Did you mean: hk has his so xi z xu su ?
| 赫 | hè | awe-inspiring / abbr. for 赫茲|赫兹[he4 zi1], hertz (Hz) |
| 兆周 | zhào zhōu | megacycle (MC), equals 1,000,000 Hz |
| 赫兹 | hè zī | hertz (Hz), unit of frequency |
| 千周 | qiān zhōu | kilocycle (KC), equals to 1,000 Hz |
| 标准音 | biāo zhǔn yīn | standard pronunciation / standard tone (e.g. A = 440 Hz) |