无字天书

無字天書
wúzìtiānshū
  1. (figurative) text that is difficult to comprehend; abstruse writing
  2. (mythology) writing from a supernatural being
  3. text that is difficult to comprehend; abstruse writing
  4. writing from a supernatural being

Wiktionary

Entry Composition

=1 无 mó used in 南无 nāmó
=1 无 wú
  1. not to have
  2. no
  3. none
  4. not
  5. to lack
  6. un-
  7. -less
2 字 zì
  1. letter
  2. symbol
  3. character
  4. word
  5. courtesy or style name traditionally given to males aged 20 in dynastic China

classifier: 個
3 天书 tiānshū
  1. imperial edict
  2. heavenly book (superstition)
  3. obscure or illegible writing
  4. double dutch