An oil tanker stands for a vast reserve of energy moved with great care, since a spill would spread far. Tradition reads it as power that needs handling, and as the fear that something contained could leak into everything around it.
Where in your waking life have you met something like this lately?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.