1. The letter $t$ in math often represents a variable, commonly used to denote time in equations and functions. 2. It is a placeholder that can take on different values depending on the context of the problem. 3. For example, in physics, $t$ usually stands for time, such as in the equation for velocity $v = \frac{d}{t}$ where $d$ is distance and $t$ is time. 4. In algebra or functions, $t$ can be an independent variable, like in $y = 2t + 3$, where changing $t$ changes the value of $y$. 5. The meaning of $t$ depends on the problem, but it is generally a variable that you solve for or use to describe change over time or another dimension. 6. Remember, variables like $t$ are symbols that help us write general formulas and solve equations systematically.