The @ sign is an example of something that might be described as a spiral.
A staircase that curves around and around a pole is an example of something that would be described as a spiral staircase.
The wage-price spiral.
A spiral notebook.
An inflationary spiral ending in financial collapse.
The @ sign is an example of a spiral.
When unemployment causes a decline in consumer confidence that causes a reduction in buying that causes more unemployment, this is an example of an economic spiral.
When you turn to drugs and drinking and slowly fall into a worse and worse state, this is an example of a downward spiral.
The descending spiral of a falling leaf.
The falling leaves spiralled down from the tree.
Her debts were spiralling out of control.
When you begin to drink more and get more depressed and then drink some more, this is an example of a time when you spiral into addiction.