2-D: Short for two-dimensional. This term is an adjective for something in a flat world, meaning it has features that can be described in only two dimensions — width and length.
comet: A celestial object consisting of a nucleus of ice and dust. When a comet passes near the sun, gas and dust vaporize off the comet’s surface, creating its trailing “tail.”
edge: (in network mathematics) A connection or link between two people or things.
field: An area of study, as in: Her field of research is biology.
hexagon: A geometric shape that has six equal sides. It takes its name from the Greek word for six.
online: (n.) On the internet. (adj.) A term for what can be found or accessed on the internet.
peer review: (in research) A process in which experts in a field carefully read and critique the work of their peers before it is published in a research journal. Peer review helps to prevent sloppy science and bad mistakes from being published.
physicist: A scientist who studies the nature and properties of matter and energy.
plane: (in mathematics) A flat 2-dimensional surface, meaning it has length and width but no depth. A plane also extends infinitely in all directions.
polygon: A two-dimensional (and therefore flat) shape with three or more sides.
proof: (in math) The showing, step-by-step, that a given statement is true.
square: (in geometry) A rectangle with four sides of equal length.