I have a copy of an existing database with existing records. when i was playing around with the table designer and noticed some of the column names have  around them. they all seem to be arbitrary typed (float, datetime, netext, nvarchar etc) and there is nothing in column properties that gets rid of the . I tried to rename delete the  but it reappaears as soon as I exit edit.
according to this post, it is a keyword column for xml columns? but none of those columns are xml columns. Would someone kindly explain the purpose of this to a ms-sql newbie? thanks
The square brackets
 are used to delimit identifiers. This is necessary if the column name is a reserved keyword or contains special characters such as a space or hyphen.
Some users also like to use square brackets even when they are not necessary.
Are enclosed in double quotation marks (") or brackets ([ ]). Identifiers that comply with the rules for the format of identifiers may or may not be delimited.
SELECT * FROM [TableX] --Delimiter is optional. WHERE [KeyCol] = 124 --Delimiter is optional.
Identifiers that do not comply with all of the rules for identifiers must be delimited in a Transact-SQL statement.
SELECT * FROM [My Table] --Identifier contains a space and uses a reserved keyword. WHERE [order] = 10 --Identifier is a reserved keyword.