divider
n.a thin wall or line that separates two things. You use it to keep things organized or to make sure they do not touch each other.
n.a physical partition or a line that separates two distinct areas, objects, or groups. Often used in technical contexts to describe a component that separates signals or a physical barrier in a room.
“She uses a plastic divider to keep her pens and pencils separate.”
“The office manager installed a glass divider between the two desks to reduce noise and improve privacy.”
“In electrical engineering, a signal divider is a circuit that reduces the amplitude of an input signal by a fixed ratio, allowing for safe measurement of high-voltage sources.”
PIE word *dwóh₁ From divide + -er.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.