Word

HSK	Not in HSK
FREQUENCY	Unknown

注音 zhù yīn

to indicate the pronunciation of Chinese characters using Pinyin or Bopomofo etc
phonetic notation
(specifically) Bopomofo (abbr. for 注音符號|注音符号[zhu4 yin1 fu2 hao4])

注 zhù HSK 3	concentrate, focus, direct
音 yīn HSK 3	sound, tone, pitch, pronunciation