Yort (ヨーヨット,Yōyotto, roughly "Yoyacht" in Japan) is a virus from the Mega Man Battle Network series. This virus shoots out a yo-yo blade from itself, launching the yo-yo along the row which eventually comes back to itself. Variants shoot the yo-yos out faster as the levels increase.
Yort is white and purple with green eyes. They shoot red yo-yos.
Yurt (ヨーシップ,Yurt roughly "Yoship") is yellow and black with red eyes. They shoot green yo-yos. These launch their yo-yos much more frequently than Yorts.
Yart (ヨーランド,Yart "Yoland") is white and yellow with purple eyes. They shoot blue yo-yos. These launch their yo-yos much more frequently than Yurts.
YortΩ (ヨーヨットSP) is white and black with blue eyes. They shoot yellow yo-yos.
BigYart (unofficial name) is a sub-boss in Mega Man Network Transmission found in No Grav Zone. There are three yo-yos that circle around the sub-boss as it hovers up and down, acting as shields. Its only vulnerable spot is a tiny opening in the middle. It also shoots out homing missiles that can damage its target. Those missiles can be destroyed.
Yo-Yo (ヨーヨー,Yōyō) is the Battle Chip from Yort viruses. The user attacks with a large bladed yo-yo that moves three squares ahead and returns, hitting two times. In Mega Man Battle Network 5 and 6 it can form the Program Advance Great Yo-Yo.