The Manual of Heraldry

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The lozenge is formed by four equal and parallel lines but not rectangular, two of its opposite angles being acute, and two obtuse.

Ex. Argent, a lozenge, vert.

The fusil is narrower than the lozenge, the angles at the chief and base being more acute, and the others more obtuse.

Ex. Argent, a fusil, purpure.

The mascle is in the shape of a lozenge but perforated through its whole extent except a narrow border.

Ex. Gules, a mascle, argent.

The fret is formed by two lines interlaced in saltier with a mascle.

Ex. Azure, a fret, argent.