Pictogram. -- See graphic narrative, and pictorial unit bar chart.

Pictorial Map. -- See statistical map.

Pictorial Unit Bar Chart. -- A bar chart in which comparisons are made by using a number of symbols, each of which represents a specific value.

Pie Chart. -- See sector chart.

Pin Map. -- See statistical map.

Plate. -- The composition, whether zinc, lead, etc., which is used to make the printed impression on paper.

Plotting (Plotted). -- Placing a curve or other representations on a grid.

Procedure Chart. -- A time study by which procedure in production may be planned and recorded. See progress chart.

Process Chart. -- A time study by which production may be analyzed, planned, and recorded. See progress chart.

Production Control Chart. -- A time study by which production may be planned, controlled, and recorded. See progress chart.

Progress Chart. -- A time study by which production and transportation movements may be planned and recorded.

Progressive Average Curve. -- A curve in which each value is the average of all the items previously shown.

Proportional Map. -- See distorted map.

Range Bar. -- A bar form of high-low chart in which the range of prices of stocks or commodities may be indicated. See highlow chart.

Rank Chart. -- See rating chart.

Rate-of -Change Chart. -- See ratio chart.

Rating Chart. -- The presentation of the rank of items as determined by the quantitative value of each item.

Ratio Chart. -- A curve chart in which the amount scale rather than an arithmetic scale is so spaced that a straight line diagonally