Final answer:
When stamped on a cylinder in physics, the * symbol represents a dimensionless quantity, not the cylinder's mass, volume, capacity, or pressure.
Step-by-step explanation:
When a symbol, such as an asterisk (*), is stamped on a cylinder in physics, it typically represents a physical quantity's dimensions. In this case, the * symbol indicates that the quantity is dimensionless.
Physicists often use square brackets around the symbol for a physical quantity to represent the dimensions of that quantity. For example, if we use the symbol V for the volume of a cylinder, then [V] = L³, indicating that the dimensions of volume are length cubed.
Therefore, the correct answer is none of the options provided in the question. The * symbol does not represent the cylinder's mass, volume, capacity, or pressure. Instead, it symbolizes a dimensionless quantity.