the.com/separator
The thing whose entire job is standing between two things that would otherwise touch.
means A device, character, or layer that keeps distinct elements apart so they stay organized or unmixed.
from From Latin separare, to set apart, from se- (apart) plus parare (to prepare) — literally preparing things to be alone.
Dairy debutCream separators spun milk into fortunes in the 1870s.
Comma cousinIn code, commas and semicolons are humble separators.
Oil rigsIndustrial separators split gas, oil, and water apart.