Table Constructor Returns a table of one or more columns.
Syntax
{ scalarExpr1, scalarExpr2, … }
{ ( scalarExpr1, scalarExpr2, … ), ( scalarExpr1, scalarExpr2, … ), … }
Parameters
ScalarExprN – Any DAX expression that returns a scalar value.
Return Value
A table of one or more columns. When there is only one column, the name of the column is Value. When there are N columns where N 1, the names of the columns from left to right are Value1, Value2, …, ValueN.
Reference Data
https://docs.microsoft.com/en-us/dax/dax-function-reference