spiritus asper

Etymology
From.

Noun

 * 1)  A diacritic mark ( ʻ ) in Ancient Greek used to indicate aspiration of an initial vowel or rho; also used for a similar sound in the Wade–Giles system of romanization for Mandarin Chinese.
 * The spiritus asper mark looks like an opening single quote, as in the word εὑρίσκω (heurískõ), the word εὕρηκα (heúrēka), or the word ἕξις (, "habit").

Etymology
From +.

Noun

 * 1) spiritus asper