: Neuroscientists using facial-recognition software have found that "RBF" faces show subtle signals of contempt —such as a slightly raised lip or squinted eyes—even when the person feels neutral.

Commonly known as , RBF refers to a neutral facial expression that unintentionally appears angry, annoyed, or contemptuous.

In business, RBF stands for , a method for raising capital without giving up equity or taking on traditional debt.

: Research indicates that while both men and women can have RBF, it is disproportionately attributed to women due to societal expectations for them to appear pleasant or "smile more".