As-Sakt is a short pause with a breath delay when intending to continue the reciting. As-Sakt is marked by a small letter س on top of the last letter of a word after which we should pause. There is a short pause in the Qur'an in four places:
1. Surah Kahf, Ayah 1-2:
وَلَمۡ يَجۡعَل لَّهُۥ عِوَجَاۜقَيِّمًا لِّيُنذِرَ بَأۡسٗا
2. Surah Ya-Seen, Ayah 52:
3. Surah Qiyamah, Ayah 27:
4. Surah Mutaffifin, Ayah 14:
كَلَّاۖ بَلۡۜ رَانَ عَلَىٰ قُلُوبِهِم
The fifth place is permissible however is not necessary:
مَآ أَغۡنَىٰ عَنِّي مَالِيَهۡۜهَلَكَ عَنِّي سُلۡطَٰنِيَهۡ
Surah al-Haqqah, ayahs 28-29
In this case we can make shadda (doubling) and read مَالِي*َهَّ*لَكَ but it is more preferable to make a pause at the letter ـهْ without exhaling according to the rule of as-Sakt.