Name the measurement unit of water potential.

Explanation

### Step-by-Step Solution:

1. **Understanding Water Potential**: Water potential is a measure of the potential energy of water in a system and is an important concept in plant biology. It helps to understand how water moves through plants and between cells.

2. **Symbol for Water Potential**: Water potential is denoted by the Greek letter psi (Ψ), which resembles a trident.

3. **Measurement Units**: The standard unit for measuring water potential is the Pascal (Pa). This unit measures pressure, which is relevant because water potential is related to the pressure exerted by water in a system.

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