1. The problem is to express the number $(0.001)^3$ in indicial (exponential) form. 2. Recall that $0.001$ can be written as a power of 10 because $0.001 = \frac{1}{1000} = 10^{-3}$. 3. Using the rule of exponents $(a^m)^n = a^{m \times n}$, we rewrite $(0.001)^3$ as $(10^{-3})^3$. 4. Applying the exponent multiplication rule, we get: $$ (10^{-3})^3 = 10^{-3 \times 3} = 10^{-9} $$ 5. Therefore, the indicial form of $(0.001)^3$ is $10^{-9}$. This means that $(0.001)^3$ equals $10^{-9}$, which is a very small number expressed as a power of 10.