You are searching for Distrubuter Cap
The distributor cap has one post for each cylinder, and in
points ignition systems there is a central post for the current from the ignition
coil coming into the distributor. On the inside of the cap there is a
terminal that corresponds to each post, and the plug terminals are arranged around
the circumference of the cap according to the firing
order in order to send the secondary voltage to the proper spark
plug at the right time.