8 is the second cube, (23)
There are 8 notes in an octave.
8 times any triangular number is 1 less than a square.
8 is the first number in English alphabetical sequence.
An octahedron has 8 triangular faces, 6 vertices and 12 edges.
8 is the sixth Fibonacci number and the only one that is a cube.
A number is divisible by 8 if the number formed by its last three digits is divisible by 8