[Richard777 (OP)]

Displacement may be represented as a 4D vector.

Two types of displacement are; “length scale” and “incremental distance” both are represented as vectors. The displacement vectors may be named the “Reissner-Nordström vectors” and they act upon a common point which is also the center of three spatial regions.

Vector components may be related giving the Reissner-Nordström metric.
Please see attachment.