If you graph a linear function, you get a line. If you graph a quadratic function, you get something called a parabola. A parabola tends to look like a smile or a frown, depending on the function. Check out this tutorial and learn about parabolas!
Green Door Meanings. Green bursts with images of spring, and so green is symbolic of renewal, growth, rejuvenation and transformation. Green is associated with the earth, and can provide grounding energies. Green is also used in holistic healing practices because it promotes physical well-being as well as compassion.
COLORS. 1  Red â The meaning of a red signs is to prohibit an action or alarm danger. 2  Red signs instruct stopping, shutdown, emergency shutoff, or âdo notâ actions. 3  Red signs also identify and locate fire-fighting equipment. 4  Yellow â The purpose of a yellow sign is to warn.