Mirroring the set of natural numbers (which can be thought of as positives) across zero (0) on the number line to create their negatives forms the complete set of integers. The set of integers is denoted by Z. The set of natural numbers and the set of whole numbers are subsets of the set of integers.
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In January 2018 Price of individual Tron might reach 0.020$, As people do not consider Tron as profitable as BTC/LTC but Tron packs a huge potential to outrank some of top virtual currencies, this year might get some attention for Tron, as per as my predictions year might close at 0.090-0.10$ per Tron, this is not exactly a bad thing as it is new in crypto market.