what does H2O stand for?

It is the molecular formula for water.

Each molecule consists of 2 Hydrogen atoms (H) and 1 Oxygen atom (O).

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H2O stands for water. To understand the meaning of H2O, we can break it down into its components. The "H" represents the chemical symbol for hydrogen, and the subscript "2" following the "H" indicates that there are two hydrogen atoms present. The "O" represents the chemical symbol for oxygen. Hence, H2O denotes that water is composed of two hydrogen atoms bonded to one oxygen atom. Understanding chemical formulas and their meanings helps to unravel the meaning behind various compounds and elements.