Knee pads stand for protection while you work low to the ground or take a risk. Tradition reads them as preparing for falls, and as care for what bears your weight.
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.