From the perspective of rhetorical word, a symbol is a phrase or a sentence that has an apparent meaning. Moreover, it inspires the reader a wide range of meanings. Since expressing the complicated social and political ideas and indirect reflection of social and political thoughts is easier if done symbolically, so the symbol and symbolism- especially in Persian literature and specifically in the realm of Persian poetry- have had a special appearance. In addition to the factors mentioned, in the contemporary literature, paying attention to defamiliarization in literary works and the emergence of particular schools interested in ambiguity, have increased the range of symbolization. More especially, the symbol has all the features of artful ambiguity, and it is one of the major factors causes ambiguity in the poem. Thus, giving exact definitions and contemplating on symbols of contemporary poetry could resolve the ambiguity of them and help the reader to distinguish between similar figures, that is, coded kennings and symbol-like metaphors.In literature, especially in language of poetry, the inability of language to reflect obscure mystical ideas, avoiding direct expression of political and social concerns of the reader in the course of participation with an aim of creating ambiguous literary works is the main motivation towards symbol and symbolization. According widespread use of symbol and its different species can be viewed from different perspectives. The creation of ambiguity is the main purposes of using symbols (especially in contemporary poetry), so the efforts of many poets to achieve this goal have caused formation of similar symbols. The explanation and resolution of this issue can open new window for understanding the poetry in front of the audience.This paper examines the ambiguity of symbols in terms of its precise boundaries.Ambiguity is one of the important and key processes in the Iranian poetry, or in a better word, today poetry. In such poetry ambiguity is a necessity to explore the new world or from a different perspective, it is the result of this complex world. In general, in Persian poetry there are three types of ambiguity such as: nonessential ambiguity, intentional and unintentional ambiguity.An effective literary texts, owes its origin to creation of multiple meanings and spreading its levels of meaning. One of the serious differences between literary work with other linguistic works is the plurality of meaning. Richness and depth of literary texts and creation a range of meanings, is the result of ambiguity. In this respect, engaging the reader in creating meaning will make a typical interaction between the audience and the text. Ambiguity provides opportunities for deep thinking and reacting of reader, so takes reader beyond freedom of the text within its borders and freedom of thought has to be brought for its reader.Having interaction between text and reader in the history has caused different reactions and multiple conversations with generations. This process has been interpreted as dynamicity of the literary work. The ambiguity of the poem is creating by the symbols and symbolism. So the symbol is a rhetorical element suggests the reader the apparent meaning, in addition to a wide range of meaning. In classical Persian works ambiguity in text is created indifferent forms such as kenning and metaphor and code. Today, symbol is burdening this task mostly.In past, allegory in terms of clarity divided to the four categories: Allusion, gesture, code and innuendo. Those kennings are considered as codes that vehicles are hidden in them, and perception of their meaning is difficult and sometimes impossible. So, in this case, code should be considered as a mark or word. Also there are metaphors due to their newness and uncertain senses to support new meaning according to the traditional meaning and appearance of metaphors (i.e. not considering true and apparent meaning), with multiple figurative meanings takes readers to the border of suspicion of doubt about symbols. These metaphors generally are divided into two categories: metaphors that are close to the symbol and symbols that have been decoded. Since the nature of symbol is fundamentally ambiguous and multiple causes dynamicity and depth of literary work. Poets- especially today poets - try using symbols and symbolic terms in their work or even take steps in symbolization. The scope of this paper consists of the concept of true symbols and similar ones such as coded kennings and symbol-like metaphor.As noted above, "ambiguity" is the main goal of a symbol, especially in today poetry, where the poet hides his purpose and expression in cover of meaning and makes the audience confused. Although other rhetorical elements, such as metaphor and allegory, pave the way for reaching this goal, because of signs (which lead the reader to the original meaning) cannot be as ambiguous as symbol and by semantic flexibility force reader to think deeply. Therefore, poets' efforts to connect metaphor and kenning to symbol for reaching a higher level of ambiguity, put issues like coded kennings and symbol-like metaphors in front of real symbols.