Which of the following is NOT allowed on a lifter's t-shirt?

In the context of the International Powerlifting Federation (IPF) regulations, lifters' attire is subject to specific guidelines regarding what can and cannot be displayed. The correct understanding here is that company logos are not permitted on a lifter's t-shirt during competition. This rule helps maintain a level playing field and ensures that competitions remain focused on the athletes and their performance rather than commercial branding.

In contrast, other forms of personalization or identification, such as the lifter's name, the nation they represent, and their IPF region, are permitted. These elements promote the sport's spirit by allowing lifters to showcase their individual identity and national pride while competing, which is quite significant in international events where athletes represent their countries.