Traditional:

háo ㄏㄠˊ

  1. to wail to howl

    bound form

hào ㄏㄠˋ

  1. to call out to command

    literary

  2. bugle trumpet

    bound form

  3. signal bugle call (e.g. 起床號|起床号[qi3 chuang2 hao4])

    bound form

  4. mark sign

    bound form

  5. to mark to label to assign a number
  6. name appellation (e.g. 國號|国号[guo2 hao4], 年號|年号[nian2 hao4], 遼寧號|辽宁号[Liao2 ning2 Hao4])

    bound form

  7. number designation (e.g. 237號房間|237号房间[er4 san1 qi1 hao4 fang2 jian1] "Room 237")

    after a numeral

  8. day of the month (e.g. 七號|七号[qi1 hao4] "the 7th")
  9. size type category (e.g. 五號電池|五号电池[wu3 hao4 dian4 chi2])

    bound form

  10. to feel (the pulse) (used in 號脈|号脉[hao4 mai4])

    TCM

  11. classifier for numbered people or items

Where 号 is used

Sources