87a & 87 (see below figure). Sidenote: Many of the electromechanical relays used in automotive applications are termed ISO relays. ISO relays are designed for use in the automotive industry and adhere ...

Most universal automotive relays have one armature ... light or taillight feed from the headlight switch to the front relays' 87a terminals. For a simple dash indicator light, connect one leg ...

The terminal numbers on these relays were always the same: 30, 85, 86, 87, and (sometimes) 87a or 87b, which are all from the DIN 72552 standard for automotive electrical terminals.