The United Services Automobile Association (USAA) is a San Antonio-based Fortune 500 diversified financial services group of companies including a Texas Department of Insurance-regulated reciprocal inter-insurance exchange and subsidiaries offering banking, investing, and insurance to people and families who serve, or served, in the United States Armed Forces. At the end of 2017, there were 12.4 million members.USAA was founded in 1922 in San Antonio by a group of 25 U.S. Army officers as a mechanism for mutual self-insurance when they were unable to secure auto insurance because of the perception that they, as military officers, were a high-risk group. USAA has since expanded to offer banking and insurance services to past and present members of the Armed Forces, officers and enlisted, and their families. The company ranked No. 100 in the 2018 Fortune 500 list of the largest United States corporations by total revenue.
A system is a group of interacting or interrelated entities that form a unified whole. A system is delineated by its spatial and temporal boundaries, surrounded and influenced by its environment, described by its structure and purpose and expressed in its functioning. Systems are the subjects of study of systems theory.
An error (from the Latin error, meaning "wandering") is an action which is inaccurate or incorrect. In some usages, an error is synonymous with a mistake. In statistics, "error" refers to the difference between the value which has been computed and the correct value. An error could result in failure or in a deviation from the intended performance or behaviour.
The vertical bar ( | ) is a computer character and glyph with various uses in mathematics, computing, and typography. It has many names, often related to particular meanings: Sheffer stroke (in logic), verti-bar, vbar, stick, vertical line, vertical slash, bar, pike, or pipe, and several variants on these names. It is occasionally considered an allograph of broken bar (see below).