把这三个都相乘，符号为。

You multiply them, all three, + and that's a plus sign.

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管型：这可能是一个，两个或三个字母，数字或符号。

TUBE TYPE: This may be one, two, or three alphanumerics or symbols.

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双剑号：用于第三个脚注的印刷字体附注符号。

Double dagger: a typographic symbol used as a third order reference mark.

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双剑号：用于第三个脚注的印刷字体附注符号。

Double dagger: a typographic symbol used as a third order reference mark.

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