Historically, private treasury of the Muslim caliphs to cover their personal, family and executive expenditures.
Al-safiyah
Nazir al-awqaf
Al-sadaqah
Musharakah Mutanaqisah
Bai al-'inah
Bai‘ al-’istijrar
Al-shibr
Parallel Salam
Bay` al-salam
Shariah compliant