Boundary separating two distinct areas.

Boundaries that separate or differentiate areas.

Precision instrument for dividing scales.

Mountain range in eastern Australia.

Device separating dough in portions.

In geometry, the problem of dividing a circle into areas by means of an inscribed polygon with n sides in such a way as to maximise the number of areas created by the edges and diagonals, sometimes called Moser's circle problem (named after Leo Moser), has a solution by an inductive method.

1212131415161718 H        He LiBeBCNOFNeNaMgAlSiPSClArKCaZnGaGeAsSeBrKrRbSrCdInSnSbTeIXeCsBaHgTlPbBiPoAtRnFrRaCnNhFlMcLvTsOg Condensed periodic table showing a typical dividing line.