The Biqunia system is a body in the term hadith, by Omar bin Muhammad bin Fattouh Al -Bikouni Al -Dimashqi Al -Shafi'i, who died around 1080 AH, and it is a system of the sea of ​​Al -Razz, located in 34 houses.
The system has been explained more than once, and among those who explained it are:

Saad Al-Hamid, and his explanation is considered one of the most concise explanations and contains simplification of his expressions.
Muhammad bin Abdul Baqi al-Zarqani al-Maliki, who died in 1122;
Mahmoud bin Muhammad bin Abd al-Daim, famous for his crossbow, who died in 1308;
Othman bin Al-Makki Al-Tawzi Al-Zubaidi, who died after 1330;
Muhammad bin Khalifa Al-Nabhani Al-Maliki, who died in 1369;
Hassan bin Muhammad Al-Mashat, who died in 1399;
Muhammad bin Saleh Al-Uthaymeen, who died in 1421;