What does SET ROWCOUNT 0 mean in SQL Server stored procedures?

In general, SET ROWCOUNT is used in statements to make subsequent queries, updates, and deletions affect only the specified number of rows
For example, execute the following statement together

SET ROWCOUNT 1
SELECT * from sysobjects
The result returns only one row, and if you do not add SET ROWCOUNT 1 or use SET ROWCOUNT 0
It will return all results.

I think you see the case that the stored procedure contains SET ROWCOUNT 0 because it should have set rowcount settings greater than 0, such as SET ROWCOUNT 1, so that the number of rows affected by the statement behind SET ROWCOUNT 0 is all recorded.