In this paper, I try to analyze the indicative process in decoding international signs from a communicative point of view. First of all I design a communication model according to C. S. Peirce's Semiotics (see fig. 4, 5), and I identify 12 kinds of signs in the model (see fig. 6,7). The three kinds of Iconic-Signs, (1), (2), and (3), are called pictograms and expressed by schematic pictures. The next three, (4), (5), and (6), Indexical-Signs are expressed by various kinds of real activities in the external context, such as gestures and movements of taxis and people. Numbers (7), (8), and (9), are Symbolic-Signs which are expressed by language, such as onomatopoetic words, indicative pronouns, and commom nouns. Numbers (10), (11), and (12) will be explained in the paper (see fig. 2). Though a pictogram has severe limitations in successfully communicating an object, it is one of the most useful ways to communicate in an international context such as the Olimpic games, airports, and highways. If the object represented is visible and concrete, it is very easy for graphic designers to communicate it to the user by means of (2), an Iconic Indexical Symbolic Indexical Sign which extracts certain graphic elements from the object (see fig. 11). But if the object is not visible and concrete such as "Information", "Do not enter", high or low speed, or "Hospital", it is very hard to communicate it in this way. So the designer must find other ways to represent it such as (1), an Iconic Iconic Symbolic Indexical Sign, which depends on metaphorical expression (see fig. 10) or (3), an Iconic Symbolic Symbolic Indexical Sign, which depends on cultural and historical knowledge (see fig. 12). If it is impossible to indicate the object by means of any of these three signs, it is possible to use the other 9 signs or the following combinations of these 12 kinds of signs : (A) Redundant Combination (see fig. 13), (B) Composite Combination (see fig. 14), and (C) Prescriptive Combination (see fig. 15). In this paper, I use Semiotics to explain communication process in the design of international signs.
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