Is there a name for the class of characters represented by [] in SQL Server? I am interested in the terminology for the characters you can put around table names, column names, etc. when referencing them in a query.  A name that in Microsoft SQL Server would be for []s and in MySQL would be for ``s or possibly ""s.  

I am unable to find a generic term for them anywhere and am wondering if one exists.
"I think" this is what you are referring to:

Delimited Identifiers

https://technet.microsoft.com/en-us/library/ms176027(v=sql.105).aspx

T-SQL Naming Conventions

https://docs.microsoft.com/en-us/sql/t-sql/language-elements/transact-sql-syntax-conventions-transact-sql