Guidelines for naming fields, controls, and objects
Names of fields, controls, and objects in Microsoft Access:

Can be up to 64 characters long.
Can include any combination of letters, numbers, spaces, and special characters except a period (.), an exclamation point (!), an accent grave (`), and brackets ([ ]).
Can't begin with leading spaces.
Can't include control characters (ASCII values 0 through 31).
Can't include a double quotation mark (" ) in table, view, or stored procedure names in a Microsoft Access project.
Although you can include spaces in field, control, and object names, most examples in the Microsoft Access documentation show field and control names without spaces because spaces in names can produce naming conflicts in Microsoft Visual Basic for Applications in some circumstances.

When you name a field, control, or object, it's a good idea to make sure the name doesn't duplicate the name of a property or other element used by Microsoft Access; otherwise, your database can produce unexpected behavior in some circumstances. For example, if you refer to the value of a field called Name in a table NameInfo using the syntax NameInfo.Name, Microsoft Access displays the value of the table's Name property rather than the value of the Name field.

Another way to avoid unexpected results is to always use the ! operator instead of the . (dot) operator to refer to the value of a field, control, or object. For example, the following identifier explicitly refers to the value of the Name field rather than the Name property:

[NameInfo]![Name]