In Islamic law, free gift of nature not owned by anybody or anything which is free to be used by public.
Bai‘ al-mubadalah
Bai‘ al-mahawij
Bai‘ al-maghanim hatta tuqsam
Bai‘ al-madamin
Bai‘ al-ma‘dum
Bai‘ al-ma’
Bai‘ al-laban fi duru‘ al-’an‘am
Bai‘ al-khiyar
Bai‘ al-khamr
Bai‘ al-kali bil kali
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