Final answer:
The 'left(3, Tableau)' function in Tableau returns the first three characters from the specified field. It is a part of data manipulation functions in the Tableau software, which is used for data visualization.
Step-by-step explanation:
The function left(3, Tableau) will return the first three characters from a field in Tableau, which is a data visualization tool. If we assume 'Tableau' refers to a field or column within a data source, the LEFT function extracts a specified number of characters from the beginning of the string.
For instance, if the content of a cell in the 'Tableau' field is 'DataAnalysis', the function would return 'Dat', as it extracts the leftmost three characters.