You have to define a column in your module with the name "name", and that will be displayed on your form header. If no column "name" is defined, it will display your form name followed by it's ID.

Example:

class territory(osv.osv):
    _name = "territory"
    _description = "Territory"
    _columns = {
        'name': fields.char('Insert territory name', size=64, required=True),
        (... the rest of your columns description goes here...)
    }
    _sql_constraints = [
        ('name', 'unique(name)', 'Territory name must be unique')
    ]
    _order = 'name asc'

territory()