Do you mean a bookend on a bookshelf? If you have two of them, they are likely mirror-images. One is the reflection of the other.
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an angle
3-D a circle on each end
The term that describes numbers that are easy to compute mentally is "round numbers." Round numbers are whole numbers that end in zero or five, making them simpler to work with in mental calculations. These numbers are often used in estimation and quick arithmetic tasks due to their ease of manipulation.
A prism.
a solid geometric figure whose two end faces are similar, equal, and parallel rectilinear figures, and whose sides are parallelograms.