一号

一號
yīhào
  1. first day of the month
  2. toilet
  3. (slang) top (in a homosexual relationship)

CEDICT

slang

Entry Composition

1 一 yī
  1. one
  2. single
  3. a (article)
  4. as soon as
  5. entire; whole; all; throughout
  6. "one" radical in Chinese characters (Kangxi radical 1)
  7. also pr. yāo for greater clarity when spelling out numbers digit by digit
2 号 hào
  1. ordinal number
  2. day of a month
  3. mark
  4. sign
  5. business establishment
  6. size
  7. ship suffix
  8. horn (wind instrument)
  9. bugle call
  10. assumed name
  11. to take a pulse
  12. classifier used to indicate number of people