Context: There are no dedicated IPA symbols for degrees of aspiration and typically only two degrees are marked: unaspirated ⟨k⟩ and aspirated ⟨kʰ⟩. An old symbol for light aspiration was ⟨ʻ⟩, but this is now obsolete. The aspiration modifier letter may be doubled to indicate especially strong or long aspiration. Hence, the two degrees of aspiration in Korean stops are sometimes transcribed ⟨kʰ kʰʰ⟩ or ⟨kʻ⟩ and ⟨kʰ⟩, but they are usually transcribed [k] and [kʰ], with the details of voice-onset time given numerically.

Question: There are no IPA symbols for what?
Answer: degrees of aspiration

Question: What may be doubled to indicate a long aspiration?
Answer: aspiration modifier

Question: What language, according to the text, may need double stops to indicate aspiration length?
Answer: Korean

Question: How are voice-onset time details usually presented?
Answer: numerically

Question: Which two IPA symbols are marked?
Answer: Unanswerable

Question: The two degrees of aspiration in English stops are transcribed as what?
Answer: Unanswerable

Question: The details of voice-onset symbols are given how?
Answer: Unanswerable

Question: Which old letter for light aspiration is now obsolete?
Answer: Unanswerable

Question: The aspiration modifier letter may be tripled to indicate what?
Answer: Unanswerable