At certain points in the Format utility, you must name something. In these cases, you are free to specify any string you want for the name. If the name has white space in it, the entire name must be enclosed in double quotation marks ("). Otherwise, only the first word of the name is used.
For example, if you want to identify a specific partition table for a disk, you can use the name subcommand that is available from the partition menu:
partition> name Enter table name (remember quotes): "new disk3"