Gabyoall

Gabyoall (ガビョール Gabyōru), also known as Gabyool and Spine, is a series of low-lying security robots that travels back and forth on a surface to obstruct intruders.
They mostly appear on floors and platforms, usually speeding up when the player is on the same floor, but there are also varieties that occupy ceilings and walls. Some can only be destroyed with certain special weapons such as the Rolling Cutter and the Ring Boomerang; however, others are invincible to all weapons.

Their name may be derived from the Japanese word "gabyou", which means thumbtack.