Like acronyms, you use the first letter of each word you are trying to remember. Instead of making a new word, though, you use the letters to make a sentence. Here are some examples:

Every Good Boy Deserves Fruit (EGBDF) for the notes on a line and FACE for the notes in the spaces

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To assist in learning the order of mathematical operations, you could use the sentence My Dear Aunt Sally (Multiply, Divide, Add, Subtract)