声呐

聲吶
shēngnà
sonar (loanword)

CEDICT

loanword

Entry Composition

1 声 shēng
  1. sound
  2. voice
  3. tone
  4. noise
  5. reputation
  6. classifier for sounds
=2 呐 nà battle cry
=2 呐 na sentence-final particle (abbr. for 呢啊 nea or variant of 哪 na)