There was a recent post on the main board discussing condensers and there was a common error or substitution made for the abbreviation of microfarad. Not all that big of a deal using "Mfarad" or "ufarad" since the proper character needed to write this isn't found on a standard keyboard. But there are also several other useful signs or characters not available on your keyboard. And there are times you might be better served using some of these correct symbols or characters for clarity, especially depending on just who you're communicating with. For example, µ("micro"), ∞, ©, ¢, ®, £, €, ±, and hundreds of others that you'll likely have no use for. In Windows you can easily access these special characters using the keyboard. Go to the bottom left of the task bar to the Search window and begin typing "charmap" (w/o the quotes). Before you're done typing a window will open allowing you to open the "Character Map" tool. Click on or search for the desired character and then click on "Copy" to copy it to the clipboard. (In older versions of Windows you may need to open the Windows Start menu to access the search feature.) Go back to the text you're typing and place the cursor in the proper position, then right click and choose "paste". Or click the keyboard shortcut "Ctrl+v" to do the same thing.