(1) Reference characters (numerals are preferred), sheet numbers, and view numbers must be plain and legible, and must not be used in association with brackets or inverted commas, or enclosed within outlines, e.g., encircled. They must be oriented in the same direction as the view so as to avoid having to rotate the sheet. Reference characters should be arranged to follow the profile of the object depicted.
（圖中標號、符號應以清晰為原則表示，標示方向應以看圖的角度一致）
(2) The English alphabet must be used for letters, except where another alphabet is customarily used, such as the Greek alphabet to indicate angles, wavelengths, and mathematical formulas.
（應以英文字母表示元件符號，但可以希臘字表示角度、波長、數學方程式等慣用方式）
(3) Numbers, letters, and reference characters must measure at least .32 cm. ( 1/8 inch) in height. They should not be placed in the drawing so as to interfere with its comprehension. Therefore, they should not cross or mingle with the lines. They should not be placed upon hatched or shaded surfaces. When necessary, such as indicating a surface or cross section, a reference character may be underlined and a blank space may be left in the hatching or shading where the character occurs so that it appears distinct.
（圖中編號、符號高度應符合規定，不能交錯，元件符號不能躲在陰影中，有必要的話應以底線並挖空白標在當中）
(4) The same part of an invention appearing in more than one view of the drawing must always be designated by the same reference character, and the same reference character must never be used to designate different parts.
（同一元件就用相同的元件符號，不同元件不能用相同元件符號）
(5) Reference characters not mentioned in the description shall not appear in the drawings. Reference characters mentioned in the description must appear in the drawings.
（說明書沒講的元件符號，就不要畫在圖中，也就是，如果不重要，元件可以出現，但就不要標號）
(q) Lead lines. Lead lines are those lines between the reference characters and the details referred to. Such lines may be straight or curved and should be as short as possible. They must originate in the immediate proximity of the reference character and extend to the feature indicated. Lead lines must not cross each other. Lead lines are required for each reference character except for those which indicate the surface or cross section on which they are placed. Such a reference character must be underlined to make it clear that a lead line has not been left out by mistake. Lead lines must be executed in the same way as lines in the drawing. See paragraph (l) of this section.
（圖中元件符號以標線（lead line，可以是直線或曲線，盡量短）指出要描述的元件；標線應緊鄰元件符號，再延伸至要標示的元件；標線不能彼此交錯；每個元件符號應該都要有標線，除了要標示一個表面或剖面...(或標示一個大範圍、標示整張圖等，這我加的)，可以在元件符號加上底線標示；圖中標線應以相同方式標示。）
範例（高爾夫練習場）：
其他：
Ron
