SQL Server DOUBLE keyword There is a reserved keyword DOUBLE in SQL Server, but I know that it's not a data type (other languages' double is float or real in SQL Server); does anyone know why this is a keyword?

I've tried to use it in SQL Server 2008 and SQL Server 2012 and I cannot use it as a data type nor a function and I cannot find any info in MSDN pages; only that it is a reserved keyword and it isn't a data type.
This is actually part of the DOUBLE PRECISION type, synonym of float(53).

https://msdn.microsoft.com/en-us/library/ms173773.aspx