CROSSJOIN Returns a table that contains the Cartesian product of all rows from all tables in the arguments. The columns in the new table are all the columns in all the argument tables.
Syntax
CROSSJOIN(table, table[, table]…)
Parameters
table – Any DAX expression that returns a table of data
Return Value
A table that contains the Cartesian product of all rows from all tables in the arguments.
Reference Data
https://docs.microsoft.com/en-us/dax/dax-function-reference