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Polycarbonate—A type of plastic used in sign faces, noted for its heat-resistance and impact strength. Polymer—A stable chemical compound or mixture of compounds consisting essentially of repeated structural units. Monomer-based UV-curing inks, once cured, become a solid polymer. Polymerization—The process of combining unstable molecules to form solid polymer structures. Specifi cally in UV-curing, polymerization describes the chain growth of monomers and/or oligomers that have been triggered by a photoinitiator and/or sensitizer in the ink. Polypropylene—A type of plastic used in banners, noted for its fl exibility at low temperatures and its resistance to chemicals. Noted for is recyclability. Polyurethane—Any of various synthetic polymers used in elastic fi bers, molded products, coatings, etc. Porcelain Sign—A traditional type of metal sign utilizing porcelain enamel paints topped by a ceramic slip to create a durable, glass-like surface that's impervious to the environment. Port, IP—In electronic digital signage, a numerically designated access point for messages of a particular type in TCP/IP network communications. Portable Sign—A freestanding, on-premise sign that is not designed to be permanently affi xed to a base. Positive Space—In design, the copy and art seen on a sign face. The opposite of negative space. Poster—A series of paper sheets printed for use on a billboard. Also, a type of sign, typically printed on paper, and intended for indoor use. Posterization—Process of changing the number of colors in an image, usually to a lesser total. Can sometimes aid in speeding the RIP process by providing less information for rasterization, but can affect specifi c color integrity. PostScript—Graphics language that creates vector-based images that, by computer code, allows for proportional scaling. It's what makes most scalable type and artwork possible for most Windows- and Macintosh-based graphics software. Pounce Pad—A small fabric pouch fi lled with white chalk powder that, once a paper with perforations outlining a design is laid over the substrate, can be patted over, leaving behind powder marks of the design to be painted. Pounce Pattern—A full-sized pattern of any design to be painted. Once the pattern is created, the outline is perforated using a manual or electric tool. The pattern is then held fi rmly against the substrate and the perforations patted with powder using a pounce pad, leaving an outline of the design. PPI (Pixels Per Inch)—In digital printing, describes how many of the pixels in a raster image will occur in one inch. The higher the number of pixels-per-inch, the greater the resolution and the less distinguishable each becomes. PPI (Pulses Per Inch)—In laser engraving, the number of times a laser beam fi res per inch of horizontal travel. Prefl ighting—Checking a graphic fi le for potential problems before sending it for fi nal output, essentially to fi nd font, color and other problems. Usually done with software. Pressure Sensitive Adhesive (PSA)—An adhesive that activates its adhesive properties only when pressure is applied to the surfaces it is to be adhered to. Sometimes used to refer to vinyl with a pressure sensitive adhesive backing such as in PSA vinyl. Primary Colors—Color that cannot be created by mixing other colors within the gamut of a given color space, but mix to create all other color combinations within that space. Red, green and blue (RGB) are additive primaries of emitted light, while cyan, magenta and yellow (CMY) are subtractive primaries of refl ected light. Black (K) is added to CMY to produce denser, truer black images. Primary Wiring—Electrical wiring that directly connects a device, such as a neon transformer, to the breaker box. Prime—To coat a raw substrate prior to the application of paint or adhesive. A primer coat Mid-J SIGN & DIGITAL GRAPHICS prevents subsequent coats of paint or adhesive from being absorbed. Print Driver—Computer software that allows the computer to communicate with and control the actions of a printer or other output device. Printhead—The device in an inkjet printer that shoots droplets of ink onto the substrate. Printheads contain nozzles (grouped by color), and typically shuttle back and forth across the substrate as ink droplets are forced out of the nozzles. Most printheads are either thermal or piezo (piezoelectric). Print Stroke—In screen printing, a pass of the squeegee across the screen in screen printing that forces the ink through the stencil onto the substrate. Process Color—The three primary colors of printing—cyan (blue); magenta (red); and yellow; plus black. When printed as halftones in that order, they create a full range of natural colors. Their printing is also known as four-color process or CMYK. Production Area—Space on a router or engraving table where the tool can touch the substrate and cut. Some tables may have non-production areas (or margins) for setting of clamps, etc. Profi le—In color management, a data fi le that describes various characteristics and attributes of a computer monitor, printer ink and/or media, which when used in combination, yield predictable color results. Standards for the creation of profi les were established by the ICC. Projecting Sign—A sign that is attached to a building but extends beyond the building structure. PSA Vinyl—A type of vinyl fi lm that has an pressure sensitive adhesive backing that adheres to a surface only when pressure is applied. Public IP Multicast Displays—A device capable of receiving an IP multicast transmission and displaying the contents, often used to update large numbers of visual display devices including digital signage. Pulsating DC—A rectifi ed AC voltage without a fi lter capacitor. GLOSSARY