indicates an exclusive disjunction with أَمْ (ʔam, “or”), as in alternative questions
Tính thường xuyên
Phát âm là (IPA)
/hal/
Từ nguyên (Tiếng Anh)
Univerbation of هَـ (ha-, now interrogative أَ (ʔa)) + لـ (l-, affirmative particle, found as لَـ (la-, “truly”) and the exhortative لِـ (li-) the vowel of which disappears between فَـ (fa-) or وَ (wa) and a following verb).