"Direction" in math isn't a single concept. Depending on the context, it mainly has two meanings: one is the "direction" in geometry/vectors (like direction vectors or directional numbers), and the other is the "orientation" in elementary math (like northeast or southwest). Besides, "mathematical direction" can also refer to a branch of the subject (like pure math or applied math).
The Fibonacci sequence is a series where each term from the third one onward equals the sum of the two preceding terms. A common sequence is 0, 1, 1, 2, 3, 5, 8… It was introduced by the Italian mathematician Fibonacci in 1202 and is famous because of the rabbit reproduction problem. It's also called the 'rabbit sequence' or the 'golden ratio sequence'.
It's a unit that represents the ratio of sound intensity or electrical signal power, usually shown as dB. It's mainly used to measure how loud or soft a sound is.
A icosahedron is a type of symmetrical polyhedron with 20 faces, 12 vertices, and 30 edges, where each face is an equilateral triangle, and it's one of the five Platonic solids.
In a fraction, the number or algebraic expression written below the fraction line is called the denominator.
In computer technology, 2D graphics refer to computer-based digital image generation, that is, two-dimensional computer graphics; in everyday life and in math, it more often means flat shapes with only length and width and no thickness.
Generally, if A and B represent two polynomials, and B contains a variable, then the expression A / B is called a rational expression, where A is called the numerator and B is called the denominator.