Here's what that means:

* 0.9%: This indicates that there is 0.9 grams of sodium chloride (NaCl) dissolved in 100 milliliters (ml) of water.

* Sodium chloride: This is the chemical name for table salt.

* Solution: This refers to a mixture of one or more substances dissolved in a liquid (in this case, water).

Normal saline is a very common solution used in various medical and scientific settings. It's important to note that:

* It's NOT the same as a 0.9 molar (M) solution. Molarity is a different way to express concentration, based on the number of moles of solute per liter of solution.

* It's isotonic with human blood. This means that the concentration of solutes inside the blood cells is roughly the same as in the saline solution, preventing the cells from shrinking or bursting.

Let me know if you'd like more information about normal saline or other types of salt solutions!