Tcl uses curly braces ({) and (}) as preferred method for escaping special characters and writing valid, complex arguments. For the following situations, you can enclose the element in braces and leave the contents alone:
You should consider using the backslash for escaping only in the limited situations that using curly braces results in unmatched braces, the last character of the argument is a backslash, or the element contains a backslash followed by another backslash indicating a new line.