Screen. -- A cross-lined screen, usually glass, through which copy is photographed for reproduction as a halftone.

Sector Chart. -- The presentation of data in the form of a circle divided so that each sector is proportional to the corresponding facts.

Semi- Logarithmic Chart. -- See ratio chart.

Shot-Gun Chart. -- See scatter chart.

Signature. -- A folded printed sheet ready to be assembled with other folded sheets to be bound together. A signature usually consists of 16 pages, but it may be 4, 8. 32, or even 64 pages.

Stair Chart. -- A chart in which a line plotted on a grid resembles stairs.

Staircase Chart. -- See stair chart.

Statistical Map. -- A map on which dots, circles, bars, curves, symbols, or crosshatchings have been placed to give the geographic location in accordance with statistical data.

Tabulation. -- The recording of statistical data in the form of tables.

Three-Dimensional Chart. -- A graphic presentation with three variables. Three-dimensional charts may be drawings in perspective or models.

Two- Directional Bar Chart. -- See bilateral bar chart.

Traffic Map. -- A flow map showing the flow of automobiles or persons on streets and highways. See How map.

Two-Way Bar Chart. -- See bilateral bar chart.

Zee Chart. -- A curve chart presenting periodic (day, week, or month) data, cumulative data, and a moving total on one grid. The positions of the curves form a "Z."

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