Parallel lines, [39], [41], [162]

Pascal (1623-1662), [69], [70], [74], [75], 76, [77], [78], [95], [105], [125], [162], 169, [171], [172], [173]

Pencil of planes of the second order, [59]

Pencil of rays, [6], [7], [8], [23]; of the second order, [57], [60], [79], [81]

Perspective position, [6], [8], [35], [37], 51, [53], [71]

Plane system, [16], [23]

Planes on space, [17]

Point of contact, [87], [88], [89], [90]

Point system, [16], [23]

Point-row, [6], [7], [8], [9], [23]; of the second order, [55], [60], [61], [66], [67], [72]