A non-standard ad unit is a type of ad placement on a website or app that does not conform to the standard ad formats and sizes that are commonly used in the online advertising industry. Non-standard ad units can take many forms, such as custom sizes, shapes, or formats, and can be used to create unique and engaging ad experiences for users. Non-standard ad units can be effective for advertisers who want to differentiate their ads from the competition, and who want to deliver value and relevance to their target audience. Non-standard ad units can also be beneficial for publishers and platforms, as they can help to maximize the value and revenue of their ad inventory, and to provide a better user experience for their audience.