Returns the physical units of the argument.
        
        
            Arguments
        
        
            
                
                
                
                
                
                
                    
                        | Number | Type | Compulsory | Default | Description | 
                    
                        | 1 | any | Yes |  | vector or vector name | 
                
            
        
        
            Returns
        
        
            Return type: string
        
        
            Possible return values are:
        
        
            - 
                " (meaning dimensionless)
            
- 
                '?' (meaning unknown)
            
- 
                'V'
            
- 
                'A'
            
- 
                'Secs'
            
- 
                'Hertz'
            
- 
                'Ohm'
            
- 
                'Sie'
            
- 
                'F'
            
- 
                'H'
            
- 
                'J'
            
- 
                'W'
            
- 
                'C'
            
- 
                'Vs'
            
- 
                'V???MATH???^2???MATH???'
            
- 
                'V???MATH???^2???MATH???/Hz'
            
- 
                'V/rtHz'
            
- 
                'A???MATH???^2???MATH???'
            
- 
                'A???MATH???^2???MATH???/Hz'
            
- 
                'A/rtHz'
            
- 
                'V/s'
            
        
        
            See Also