Field

Don't capitalize when used as part of a name, unless in a heading or considered part of the proper name.

Don’t list the following UI element types unless needed for clarity or navigation: button, checkbox, drop-down button, field, icon, menu, link, radio button, or window. For example, write Click Save, not Click the Save button.

When referring to fields in relation to objects, use on instead of in. For example: When you create a custom field on a standard object, you must add the custom field to your package explicitly.