This is the so-called pinch note. Annotation is a form of annotation for books and articles, which is printed in the middle of the text. Annotations are often used in ancient books in China. Footnotes are generally located at the bottom of the page and can be used as comments on some contents in the document; Endnotes are generally located at the end of the document, listing the source of quotations, etc.

With the extensive use of punctuation marks and the popularization of horizontal printing, the font of brackets can be as big as the text when using "brackets" (such as various forms of brackets), but in order to distinguish the text from comments, the font of comments has been changed.

The content of parenthesis expands with the expansion of the meaning of "annotation". At first, it was limited to the annotation of Jing Yi, and later it developed into phonetic notation, exegesis, word discrimination, chapter analysis, sentence analysis, textual research of famous things, inference of word meaning, collation of different texts, and indication of sources.

Extended data:

General requirements for Chinese annotations of papers:

1, leaving two lines in the text;

2. Separate or merge comments according to the index number in the text;

3. "Notes" are in bold type No.5, and the contents of the notes are Song Ti No.5 in Chinese and Times New Roman in English.

General requirements for Chinese and English annotations in papers;

1, there should be a reference mark in the text, such as ××× [1];

2. If the same work by the same author appears repeatedly, only the author's surname and the page number of the quotation shall be indicated (a comma shall be added between the surname and the page number);

3. (Leave two boxes blank) Author's name (first name, last name, followed by an English period), book title (italicized, followed by an English period), place of publication (followed by a colon), publishing house or publisher (followed by a comma), date of publication (followed by a comma) and page number (followed by an English period).

4. (Empty two boxes) Author's name (first name, last name, followed by an English period), article title (article title with "") (empty one box) followed by magazine name (italicized, followed by a comma), volume number (issue number), publication year, page number and English period.

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