Four-leaf Clover

A four-leaf clover is a type of clover flower. Graham discovered one in a meadow in daventry. He put it in his adventurer's cap for good luck. It protected him from the leprechauns. It was still tucked into his hat, when he travelled to Kolyma to save the Valanice.

Background
This type of clover is supposed to bring good luck to its wearer. It is not, however, the same as a shamrock. The shamrock--the symbol of Ireland and the favorite of leprechauns--is a three-leave clover, and not the same plant at all. This confusion between the two different plans is so widespread that, evidently, even the leprechauns of Daventry themselves get confused.

Behind the scenes
In the original KQ1, this was known as the "fourleaf clover", in the remake its the "Four-leaf Clover", in the sega version its the "4 Leafer".