Japanese name : Bushukan (fingered citron)
The citron was already cultivated in Mesopotamia before 500BC. Citron fruits are usually oval to rounded in shape and turn from green to a golden yellow when riped. Those pictured above are extreme forms when the fruits become divided into fingers called "fingered citron" or "Buddha's hand citron".
To read more about Buddha's hands from Wikipedia, click here.
These fruits pictured above are sold at Chin Pomelo Farm, the place I photographed them. You can also view a specimen tree at the Secret Garden of 1-Utama, Petaling Jaya. I have seen the rounded fruits as well as fingered citron there.