mnemonic
noun [ C ] uk/nɪˈmɒn.ɪk/ us/nɪˈmɑː.nɪk/
帮助记忆的诗歌（或词句等）;助记符号;助记顺口溜
something such as a very short poem or a special word used to help a person remember something
The musical notes on the lines go EGBDF - use the mnemonic "Every good boy deserves fun". 谱线上的音符为 EGBDF，用的助记句子是“Every good boy deserves fun（每个好男孩都该得到快乐）”。