a Triton's trumpet (Charonia tritonis) shell used in ancient times as a horn to signal troop movements

noble; exalted; sacred / precious; valuable / (Internet slang) glorious; marvelous; wonderful (ascending 萌え (moe))

autosuggestion (suggesting thoughts to oneself) / autohypnosis (making oneself believe in something)

(topology) topological space / (mathematics, physics) phase space