Japanese for rain. Here is the Kanji:
############
#
####################
# # #
# ### # ### #
# # #
# ### # ### #
# # ##
# # #
Scholars feel that the:
_____
| |
| |
...represents the shape of a cloud while the dots represent rain and the vertical line in the center represents the concept of falling.
Also pronounced U (as in uki, the rainy season) or ama- (as in amagumo, a rain cloud).