乎古止點喺字周圍加點之類嘅符號，表示呢個位置有助詞、助動詞，兼且能區分音節，輔助訓讀。喺奈良、平安時代嗰時開始有，用法因流派而有所唔同，據考有一百幾種咁多。
Symbols such as dots are added around the word to indicate that there are auxiliary words and auxiliary verbs in this position, and they can distinguish syllables and assist in reading. It began to exist in the Nara and Heian periods, and the usage varies depending on the genre, but there are more than 100 kinds of usage.