Standard parentheses

	((1 - 2) * (2 + 3))

Nonstandard parentheses (like absolute value signs)

	||1 - 2| * |2 + 3||

What if numbers next to eachother signified multiplication?

	| 1 | 2 | 3 |

	abs(1) * 2 * abs(3) or
	abs(1 * abs(2) * 3)