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A '''pictogram''' or '''pictograph''' is a symbol representing an object or concept by illustration. '''Pictography''' is a form of writing whereby ideas are transmitted through drawing. It is the basis of Cuneiform (script) cuneiform and hieroglyphs.
Early written symbols were based on pictograms, pictures which resemble what they signify, and ideograms, pictures which represent ideas; it is commonly believed that pictograms appeared before ideograms. They were used by various ancient cultures all over the world since around 9000 BC and began to develop into logogram logographic writing systems around 5000 BC. Pictograms are still in use as the main medium of written communication in some non-literate cultures in Africa, The Americas, and Oceania, and are often used as simple symbols by most contemporary cultures.
The earliest uses of pictograms in Mesopotamia predated the famous Sumerian Cuneiform script cuneiforms (oldest of which date to around 3400 BC). As far as around 9000 BC tokens marked with simple pictures began to be used to label basic farm produce, and around 6000 BC, with the rise of cities and spread of basic craftmanship more complex pictographic tokens were devised to label manufactured goods. Eventually, the tokens were replaced by clay tablets, on which symbols were drawn with a blunt reed (plant) reed called a stylus. The impressions left by the stylus were wedge shaped, thus giving rise to the name cuneiform, wedge-writing. [http://pandora.cii.wwu.edu/vajda/ling201/test4materials/Writing2.htm]
Image:Water,Rabbit,Deer.jpg Water, Rabbit, Deer|thumb|Water, rabbit, deer pictograms on a replica of an [[Aztec Stone of the Sun. ]]
Though written Chinese written language Chinese is often thought of consisting of pictograms, less than 1% of all Chinese character characters ever created have their direct origins in pictograms. The letters of the Roman alphabet, however, do have their origins in pictograms. For example, the letter ''A'' represented the head of an ox, and if it is turned upside down, a bovine head with horns can be seen.
image:road-sign-horse.jpg thumb|left|150px|The top traffic sign warns of horse and riders
Pictograms remain in common use today, serving as signs or instructions. Because of their graphical nature and fairly realistical style, they are widely used to indicate public toilets, or places such as airports and train stations. However, even these symbols are highly culture-specific. For example, in some cultures men commonly wear dress-like clothing, so even restroom signage is not universal. Pictographic writing as a modernist poetic technique is credited to Ezra Pound though French surrealists accurately credit the Pacific Northwest American Indians of Alaska who introduced writing, via totem poles, to North America (Reed 2003,p.XIX).
A standard set of pictograms was defined in the international standard ''International Organization for Standardization ISO ISO_7001 7001: Public Information Symbols''. Another common set of pictograms are the laundry symbols used on clothing tags and chemical hazard labels.
In countries or regions where two or more languages are used, the typical traffic sign is very often a symbol with no writing on it. This is the case for much of Europe and several parts of Canada. Many of these signs, however, offer an abstract symbol instead of a picture, and they cannot be considered true pictograms.
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