The T distribution is a continuous z-score probability distribution when the denominator uses the estimated standard deviation rather than the true standard deviation. T-account is an informal term for a set of financial records that use double entry bookkeeping. The t-test is an inferential statistic used to determine if there is a statistically significant difference between the means of two variables. T+1 (or T+2, T+3) — abbreviations indicating the settlement date for deals. Tactical asset allocation involves taking a proactive stance on the strategic asset allocation itself and adjusting long-term target weights for the short term to capitalize on market or economic opportunities. The Taft-Hartley Act of 1947 prohibits certain activities of unions and requires them to disclose information about their financial and political activities. Accompanying rights are contractual obligations to protect a minority investor in a startup or company. In mechanical engineering, the Taguchi quality control method focuses on design and development to create efficient and reliable products. Tail risk is the probability of incurring a loss due to a rare event, as predicted by the probability distribution. Takaful is a type of Islamic insurance in which participants deposit money into a pool system to guarantee each other.