尺素

chǐsù
(literary) a one-foot-long piece of white silk, used for writing in ancient times; (as a metonym) letter; written message

CEDICT

literary

Entry Composition

1 尺 chǐ
  1. a Chinese foot
  2. one-third of a meter
  3. a ruler
  4. a tape-measure
  5. one of the three acupoints for measuring pulse in Chinese medicine

classifiers: 支, 把
2 素 sù
  1. raw silk
  2. white
  3. plain, unadorned
  4. vegetarian (food)
  5. essence
  6. nature
  7. element
  8. constituent
  9. usually
  10. always
  11. ever