interposer

But if now / You ſhould (as cruell fathers do) proclame / Your right, and Tyrant like uſurp the glory / Of my peculiar honours, not deriv'd / From ſucceſſary, but purchas'd with my bloud, / Then I muſt ſtand firſt Champion for my ſelfe, / Againſt all interpoſers.

As the name suggests, an interposer is placed in between the packaging substrate and dies to provide electrical interface routing. The objective of an interposer is to electrically reroute a terminal to different dies or to extend a connection to broader areas via wider pitch.