Microsoft Word is a blank canvas for typing anything from facts to not-yet-proven-as facts, and when you are writing specifically-scientific information, you may encounter the need to type characters you can't quite find on the keyboard. In cases of superscript and subscript, found in items such as null hypothesis symbols, Word offers a way to quickly render standard text typed on the page into its proper placement.
Open Microsoft Word. To insert the null hypothesis symbol into an existing document, click the "File" tab. Click "Open." Browse to the Word file, double-click the name and scroll to the place in the document to insert the symbol.
Press and hold down the "Shift" key while typing the letter "H" to get a capital "H." Release the "Shift" key.
Type the number zero (0). Make sure to type a zero and not a capital "O."
Highlight the zero. Right-click the highlight and select "Font."
Click a check into the "Subscript" box near the bottom of the "Font" window. Click the "OK" button. The zero is reduced to subscript, completing the null hypothesis symbol.