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Introduction of Ideogram

A graphic symbol (such as @ or %) that represents a thing or a notion with no sounds that type its name. It is also known as ideograph. The use of ideograms is called ideography.
Examples and Observations:
You may often see a picture of a finger pointing on the road.  It doesn't represent a sequence of sounds, but rather a notion that could be expressed in English in numerous ways: 'go that way' or 'in this direction' or 'over there' or, combined with words or other ideograms, such notions as 'the stairs are towards the right' or 'pick up your luggage at that spot.' Ideograms usually are not necessarily photographs of objects; the arithmetic 'minus sign' is an ideogram that depicts not an object but a notion that can be translated as 'minus' or 'subtract the following from the preceding' or 'negative.'"
◆Pictograms and Ideograms
"The difference between pictograms and ideograms isn't usually clear. Ideograms are much less direct representations, and one may have to study what a certain ideogram means. Pictograms have a tendency to be much more literal. For instance, the no parking symbol consisting of a black letter P in a red circle with a slanting red line by means of it is an ideogram. It represents the idea of no parking abstractly. A no parking symbol showing an automobile being towed away is more literal, a lot more like a pictogram."
◆The Rebus Principle
"When an ideographic method proves too cumbersome and unwieldy, the 'rebus principle' may be employed for greater efficiency. The rebus principle is a vital element in the development of several modern-day writing systems because it could be the link to representing the spoken language. Unlike pure ideograms, rebus symbols rely on how a language sounds and are specific to a certain language. For instance, if English used the symbol [graphic of an eye] for 'eye,' that could be regarded as an ideogram. But if English also started to use it to represent the pronoun 'I' or the affirmative 'aye,' that will be an example in the rebus principle in action. To be able to realize that [graphic of an eye] could imply the pronoun or the affirmative, one should also know English. You could not use that symbol to conjure up the comparable words in Spanish.