The fire extinguisher stands for control and calm in an emergency. Dream books read using one as putting out a flare-up of anger or conflict.
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.