FOUO stands for For Official Use Only, an information security designation widely used by government organizations.
“The survey found that 69 percent of respondents use their computers in public places to view sensitive information. In fact, most respondents indicated they work with multiple types of sensitive information. Fifty-seven percent stated that they work with financial/credit card data; 18 percent work with For Official Use Only (FOUO) information (this is primarily used by the United States Department of Defense as a handling instruction for Controlled Unclassified Information); 18 percent work with human resources data and 19 percent work with classified information.”
Improper Exposure of Official Use, Sensitive, and Classified Materials Occurs Every Day