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You can see that the binary representation of the decimal number $1$ is "$1$." A single binary digit is called a bit. Notice that the word "bit" comes from $\underline{\textit{b}}$inary dig$\underline{\textit{it}}$.  When writing binary numbers more formally, we tend to use the subscript $2$. Therefore, we would write the decimal number $5$ whose binary notation is  "$101$" as $101_2$. This is so that there is less confusion between decimal numbers and binary numbers.