Japanese radish
is a generic term for radish in Japanese language. For example, European radish is called  in Japan. In the West, the word daikon sometimes refers to long white Asian radish varieties and sometimes Japanese radish varieties. When it is necessary to distinguish the usual Japanese form from others, it is sometimes known as Japanese radish or .

Varieties 
The most common variety in Japan (aokubi-daikon) produces an elongated root in the shape of a giant white carrot about  long and  in diameter. Most Chinese and Indian forms are roughly similar.

The turnip-shaped giant white radish or Sakurajima radish is cultivated around Kagoshima in Japan and grows as large as  in diameter and  in mass.

References 

Asian radishes
Root vegetables
Japanese vegetables