Unique ways to represent a number

Question

I know two ways to represent a number,

1. Muliplication of primes

Any number can be represented uniquely as a product of prime numbers

2. Binomial Representation

Any number can be represented uniquely as a sum of powers of 2

Are there any other interesting ways to uniquely represent a number?

Answer 1

The Fibonacci representation (sum of Fibonacci numbers with no repeats or consecutive Fibonacci numbers).

The factorial system eg $463=3\cdot5!+4\cdot4!+1\cdot3!+0\cdot2!+1\cdot1!$ where the "digit" corresponding to $n!$ can be any of $0,1,\dots,n$.

Balanced ternary ie ternary using the digits $\bar{1},0,1$, where $\bar{1}$ represents $-1$.