What are the letters of Izhar in the Holy Quran, and how can they be found among the verses?

The letters of Izhar Halqi (guttural clear pronunciation) are six: hamzah (أ), ha (هـ), ‘ayn (ع), ha (ح), ghayn (غ), and kha (خ). These are collected in the initial letters of: "أخي هاك علمًا حازه غير خاسر" (My brother, acquire knowledge that a non-loser possesses). If one of these letters appears after a noon sakinah (a noon with a sukoon) or tanween (nunation) in one word or two words, the noon sakinah and tanween must be pronounced clearly. Izhar linguistically means clarification. Technically, it means articulating the mudhar letter (the noon sakinah or tanween) from its makhraj (point of articulation) without ghunnah (nasalization), idgham (merging), or ikhfa (concealment). For further details, refer to Tajweed books and the oral instruction of shaykhs.