Hah!!! Arms & Armor from Bastion Press!!
Meteor Hammer & Mother and Son Hammer.
Both consist of a length of finely woven rope that branches out at the end. At the end of these two braches is an ovoid weight (M&S hammer has weights in the melon size). The example given for the Meteor Hammer is taking out a carriage's horse team in one shot while sitting in a tree. Might not be the most realistic of examples, but it shows the weapon is intended to hits multiple targets at range.
Meteor Hammer (Liu Xing Chui): Medium Exotic Weapon
Damage:1d6/1d6 Crit:19-20/x2 Reach:15 ft
Mother & Son Hammer (Zi Mu Chui): Large Exotic Weapon
Damage:1d8/1d8 Crit:19-20/x2 Reach:10 ft
Both weapons can hit/threaten targets out to their respective ranges.
The book was written for 3.0, but has been recently upgraded. That book should have the 3.5 stats.
Googling for the meteor hammer came up with these images: