what does the term refer to?
The were two winds or storms that are said to have saved Japan from two Mongol fleets under Kublai Khan.
Kamikaze (typhoon)
The were two winds or storms that are said to have saved Japan from two Mongol fleets under Kublai Khan. 
what is the name of the very strong winds that can affect japan Kamikaze
wiki:12783917
Kamikaze (typhoon) [SEP] Introduction
The were two winds or storms that are said to have saved Japan from two Mongol fleets under Kublai Khan. These fleets attacked Japan in 1274 and again in 1281.. Due to the growth of Zen Buddhism among Samurai at the time, these were the first events where the typhoons were described as "divine wind" as much by their timing as by their force. Since Man'yōshū, the word "kamikaze" has been used as a "Makurakotoba" of waka introducing Ise Grand Shrine.