When registering a series, the variations must not affect the material identity of the primary mark. Common ways these series are structured include:

1. Color Variations: This is the most common type, where the logo or wordmark is registered in different color palettes (e.g., a full-color version, a grayscale version, and a black-and-white version) to ensure protection across all media formats.

2. Size and Weight Differences: A series can include marks that vary in the thickness of lines or the scale of the graphic elements, provided the overall look and feel remain consistent and recognizable to the consumer.

3. Graphic Stylization: Sometimes a series includes subtle changes in the arrangement of elements—such as a logo appearing to the left of the text in one version and above the text in another—ensuring the brand is protected regardless of how it is placed on packaging or digital headers.