Darksteel Ingot. Indestructible is a static ability that means that any permanent that has indestructible cannot be destroyed, and cannot be destroyed as a result of lethal damage.
The less-than symbol (<) represents an inequality in which the number or problem on the left is smaller than that on the right; however, it can be reversed (>) to show that the item on the left is greater than that on the right.
It could be 4 cups or it could be less than 4 cups: So until we measure it, all we can say is less than or equal to 4 cups. To show this, we add an extra line at the bottom of the less than or greater than symbol like this: The less than or equal to sign: The greater than or equal to sign: