What are the Greek symbol for water potential and the unit of pressure,respectively?

If a plant cell is immersed in water,the water continues to enter the cell until the

Cell $A$ has an osmotic pressure of $-20$ bars and a pressure potential of $5$ bars, whereas cell $B$ has an osmotic pressure of $-18$ bars and a pressure potential of $2$ bars. The direction of the flow of water will be:

The unit of water potential is $...............$.

Water potential $\psi$ is measured in bar or in:

If solution $A$ has $\Psi = -1000$ and $B$ has $\Psi = -2000$ are separated by a semipermeable membrane,which sentences are correct?
$(i)$ Solution $A$ has greater osmotic pressure
$(ii)$ Osmosis occurs toward $B$
$(iii)$ $A$ has more free water molecules
$(iv)$ At equilibrium,both will have the same water potential
$(v)$ Osmosis occurs toward $A$