He claimed a blue one from Pablo Jill when grievous injured him on collapsing satellite over Duro
He claimed a Green one from Adi Gallia on Boz Pitzy and striked her down, getting her saber.
He also got a green one from Roron Corobb when he was defending Palpatine
He got a blue one from Shaak Ti while she was Protecting Chancellor Palpatine except ensnared her from Electic Cables.
He also got one from Sifo Dyas
It is called a light saber. Light sabers can also be used by media and come in many different colors.
They use brightly painted broom handles (yes, really) pink for red lightsabers, light green for green, ect. and then light them up with animation.
Because he gets his lightsabers from the Jedi he has murdered. He basically keeps them all as trophies and the 4 that he carries are ones that he likes the most
you can make count dooku and yoda and mace windu and maris brood. p.s. the tonfa handle/maris broods lightsaber dosent work because you cant activate the light saber, unless you put the handle on backwards. trust me, i do it all the time
It means a yellow light...