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Notice that the binary representation for $1$ is simply "$1$." A single binary digit is called a bit. The word "bit" is derived from $\underline{\textit{b}}$inary dig$\underline{\textit{it}}$. \vspace{2mm}  When writing out binary numbers more formally we tend to use a subscript $2$. In this way, "$101$" would appear as $101_2$. This is so that there is less confusion between binary numbers and decimal numbers.