Which characters surround a merge field in a main document?

In a main document, merge fields are typically surrounded by special characters or delimiters that indicate where the merge field begins and ends. In Microsoft Word, for example, merge fields are often enclosed in double angle brackets, like this: «FieldName». These characters signal to the software that the text within should be replaced with data from a data source during the mail merge process. Other document processing applications may use different delimiters, but the concept remains the same.