Any of a number of diacritical marks written above or below consonants to indicate a preceding or following vowel in languages that are usually written without vowel letters, as Hebrew and Arabic.元音符号：一系列写在辅音字母上面或下面的区分符号，用来表示语言中前或后的常不用元音字母拼写的元音，如在希伯来语和阿拉伯语中