From https://en.wikipedia.org/wiki/Microsoft_SQL_Server#T-SQL
T-SQL (Transact-SQL) is the secondary means of programming and managing SQL Server.
I thought that T-SQL is the only means for programming and managing SQL Server, because it is the only SQL language used in SQL Server.
So what do possibly multiple "means of programming and managing SQL Server" mean?
What is the primary "means of programming and managing SQL Server"?
Thanks.