* Mono: Means "one" or "single."
* Monocle: A single eyeglass lens.
* Monorail: A railway with a single rail.
* Monotone: Speaking in a single tone of voice.
* Di: Means "two."
* Dinosaur: A group of extinct reptiles, often identified by their two legs.
* Diatomic: Molecules consisting of two atoms.
* Dichromatic: Having two-color vision.
* Poly: Means "many" or "multiple."
* Polyglot: Someone who speaks many languages.
* Polygon: A shape with many sides.
* Polystyrene: A plastic made up of many styrene molecules.
These prefixes are commonly used in science, math, and everyday language to describe quantities or structures.