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The SGIA Glossary of Terms serves as an excellent industry terminology resource. It is the language by which we all communicate, without it universal understanding would be impossible. Language and our ideas about how it is interpreted change rapidly. SGIA is aware of this and continues its effort to keep our constituents well informed about changes to the increasingly complex industry terminology. The definitions are for general reference only. Usage may vary between companies, individuals, or national and country customs. The information presented is as accurate as the authors and editors can ascertain and SGIA assumes no responsibility for the use of information presented herein.
The space required for the letters of the alphabet in a particular type font.
Sheet containing fonts of letters that may be removed and relocated to form words and/or lines of copy. (They are either on transparent material having a pressure sensitive adhesive back, or the letters are printed on the back of the sheet and adhered to the new substrate by burnishing).
Consisting of alphabetic and numerical symbols; a device or system that includes letters and numbers.
A change made to an image element, color, or page layout through computer manipulation.
Change in copy or specification made after production has begun.
Alternating current (AC)
Electric current that periodically reverses the direction of electron flow.
Within the meaning of the Clean Air Act (US), any method of sampling and/or analyzing for an air pollutant, which is not a reference (or equivalent) method, but which has been demonstrated to produce results adequate for the determination of compliance with the Act.
Any of several forms of aluminum oxide used as an abrasive and in marking glass, enamel, and refractories.
A white inorganic pigment used as an extender in inks and noted for its transparency.
Finely pulverized aluminum in very small flake form suitable for mixing with a varnish type or lacquer type vehicle for use in screen printing metallic effects.
A printing ink whose principal pigment consists of aluminum, finely pulverized into flaky particles, and when printed gives a silver color appearance; also referred to as silver ink.
Aluminum stearate (oxide)
A principal thickening agent used in many screen printing inks and transparent extender bases.
Acceptable abbreviation for amalgam.
Surrounding environmental conditions such as pressure, temperature, or humidity; environment coming into contact with a system or component.
The design of an instrument such that changes in ambient temperature do not affect the reading.
Temperature of the immediately surrounding air volume.
American National Standards Institute (ANSI)
A standards setting agency of the United States that approves design and performance of electrical/electronic components (USA), formerly the American Standard Association.
American Society for Testing & Materials (ASTM)
The world’s largest source of voluntary consensus standards on the characteristics and performance of materials (USA).
American Wire Gauge (AWG)
A wire diameter specification where the smaller the number designator, the larger the wire diameter.
Synthetic resin derived from the reaction of urea thiourea, melamine, or allied compounds with aldehydes, particularly formaldehyde.
Ammonium bichromate (ammonium dichromate)
A compound or salt used for rendering colloids or emulsions active to actinic light such as in photostencils.
Photography, a fixing bath containing NH4+ (univalent ion of ammonia) that is used for removing silver halides from photosensitive emulsions.
Ampere (A, amp)
A standard unit of current produced by one coulomb of charge passing a point in one second.
Capable of acting either as an acid or base.
A small hermetically sealed glass container that is designed to be filled and then sealed by fusion of the glass neck.