Stable:
The item's value will most likely not change; if it does, it wouldn't be a major change
Unstable:
The item's value is fluctuating, may end up increasing or decreasing
Declining:
The item is on track to lose a significant amount of its value
Rising:
The item is on track to gain a substantial amount of value
High:
Most demandable items, straightforward to trade and get overpaid for
Medium:
Items with good demand, likely won't have trouble getting a good deal for it
Normal:
Item has reasonable demand, not heavily sought after, but could still get a fair trade
Low:
The item has bad demand, nobody looks for it, and it will likely be underpaid for
TBA:
For items that don't have a set value, likely for newer items that are pending a value.
Fusing:
Fused items lose 30% of their original value. Hover over an item to check if its labeled with "Fusion Effect ".