وَاعْلَمْ: أَنَّ لَهُمْ ضَمِيرًا غَائِبًا يَقَعُ قَبْلَ جُمْلَةٍ تُفَسِّرُهُ، وَيُسَمَّى «ضَمِيرَ الشَّأْنِ» فِي الْمُذَكَّرِ، وَ«ضَمِيرَ الْقِصَّةِ» فِي الْمُؤَنَّثِ.
Translation: A third-person pronoun may precede an explanatory sentence: in the masculine it is called the pronoun of affair, and in the feminine the pronoun of narrative.
A pronoun of affair can introduce a matter that is explained by the following full sentence rather than refer back to a previously named person. The feminine counterpart is called a pronoun of narrative.