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number system is based on some traditional number system viz. decimal (base 10), binary (base-2), octal (base-8) and hexadecimal (base 16). The numbers in strange number system (SNS) are those numbers which are other than the numbers of traditional number system. Some of the strange numbers are unary, ternary, …, Nonary,..., unodecimal, …, vigesimal, …, sexagesimal, etc. The strange numbers are not widely known or widely used as traditional numbers in computer science, but they have charms all their own. Today, the complexity of traditional number system is steadily increasing in computing. Due to this fact, strange number system is investigated for efficiently describing and implementing in digital systems. In computing the study of strange number system (SNS) will useful to all researchers. Their awareness and detailed explanation is necessary for understanding various digital aspects. In this paper we have elaborate the concepts of strange number system (SNS), needs, number representation, arithmetic operations and inter conversion with different bases, represented in tabulated form. This paper will also helpful for knowledge seekers to easy understanding and practicing of number systems as well as to memories them