Figure-of-eight?

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Possible Answers:

OCTAGON.

Last seen on: The Sun – Two Speed Crossword – Feb 21 2019

Random information on the term “Figure-of-eight?”:

8 (eight) is the natural number following 7 and preceding 9.

8 is:

A number is divisible by 8 if its last three digits, when written in decimal, are also divisible by 8, or its last three digits are 0 when written in binary.

There are a total of eight convex deltahedra.

A polygon with eight sides is an octagon. Figurate numbers representing octagons (including eight) are called octagonal numbers.

A polyhedron with eight faces is an octahedron. A cuboctahedron has as faces six equal squares and eight equal regular triangles.

A cube has eight vertices.

Sphenic numbers always have exactly eight divisors.

The number 8 is involved with a number of interesting mathematical phenomena related to the notion of Bott periodicity. For example, if O(∞) is the direct limit of the inclusions of real orthogonal groups

then

Clifford algebras also display a periodicity of 8. For example, the algebra Cl(p + 8,q) is isomorphic to the algebra of 16 by 16 matrices with entries in Cl(p,q). We also see a period of 8 in the K-theory of spheres and in the representation theory of the rotation groups, the latter giving rise to the 8 by 8 spinorial chessboard. All of these properties are closely related to the properties of the octonions.

Figure-of-eight? on Wikipedia

Random information on the term “OCTAGON”:

Bumper pool is a pocket billiards game played on an octagonal or rectangular table fitted with an array of fixed cushioned obstacles, called bumpers, at the center of its surface.[1][2] The surface of such a table has all the same coating as for playing in an ordinary pool. As for the pockets, there are only two of them in the bumper billiards.

Playing bumper pool, balls will not move freely over the entire surface. The peculiarity of this game is just that around the perimeter of the playing field special bumpers are exposed. Therefore, getting balls into the pockets becomes very difficult.

Typically bumper pool tables are smaller than a regulation pool table.[2][3] The table has two pockets, placed opposite one another, located at the center of two of the rails.[2]

Most tables have twelve bumpers, although some tables have fourteen or sixteen.[2][3] Two bumpers flank each pocket.[2] The remaining bumpers are arranged in a cross in the center of the table, with one line of the cross in line with the pockets.[2] At the center of the cross, there is an open space just large enough to allow a ball to pass through. Tables with fourteen bumpers have three rather than two bumpers on each side of the center space on the line midway between the two holes.[2]

OCTAGON on Wikipedia