ˌ ̷ ̷ ̷ ̷ˈendə(r) noun
Etymology: double end (from double (I) + end ) + -er
1.
a. : a ship with bow and stern of similar shape
b. : a self-propelled vehicle (as a streetcar) constructed and equipped to permit normal operation in either direction
2. or double-ender file | ̷ ̷ ̷ ̷| ̷ ̷ ̷ ̷- : a file with teeth cut from both ends toward the middle