# parameterUnitSymbol

> Unit symbol of a result: the vocabulary unit, else mg/L for unmapped CAS numbers, else unit.

> **parameterUnitSymbol**(`result`): `string`

Unit symbol of a result: the vocabulary unit, else `mg/L` for unmapped CAS numbers, else `unit`.

## Parameters

### result

#### parameter

`Parameter`

#### unit?

`string`

## Returns

`string`