The figure below shows the typical trajectory a basketball player might travel as he makes a jump. You can visually see that almost half the hang time is spent near the top of the arc. Using some mathematics one can calculate the time spent in the top part of the jump.
A red octagon symbolizes stop even without the word. A symbol is an object or a concept that represents, stands for or suggests another idea, visual image, belief, action or material entity. Symbols take the form of words, sounds, gestures, ideas or visual images and are used to convey other ideas and beliefs. For example, a red octagon may be a symbol for STOP.
staff-a rod carried as a symbol. icon - (computer science) a graphic symbol (usually a simple picture) that denotes a program or a command or a data file or a concept in a graphical user interface. marking, mark, marker-a distinguishing symbol; the owner's mark was on all the sheep. identifier-a symbol that establishes the identity of the one bearing it. variable-a symbol (like x or y) that is used in mathematical or logical expressions to represent a variable quantity.