With the cursor at the insertion point where you want the symbol to appear, type 21cc, then press ALT and X simultaneously. Now, here is an even easier way to get the equilibrium symbol.
You will see a very rich selection of specialized characters available for use in Mathematical Operators. In the font box select Lucida Sans Unicode. When you want to insert a symbol, click on the Insert menu and choose Symbol. If you have the Lucida Sans Unicode font installed (check the font list in Word) you are in luck. If you are operating in a local version of MS Word on your PC, you can try one of these options: For Office 365 support on entering an equation in MS Word, please review this step-by-step guide:
