Rub el Hizb
The Rub el Hizb is an Islamic symbol in the shape of an octagram, represented as two overlapping squares ۞. While its main utility today is to mark a division inside some copies of the Quran to facilitate recitation, it has originally featured on a number of emblems and flags in the past and continues to do so today.
In Arabic, means 'one-fourth' or 'quarter', while translates to 'a group'. The Quran is divided into 60 aḥzāb, with instances of Rub el Hizb further dividing each into four, for a total of 240 divisions.