Symbol and Abbreviations
The International System of Units (SI) unit symbol for the gram is "g" following the numeric value with a space, as in "640 g". While some authors use ad-hoc abbreviations, this creates confusion. For example, the use of abbreviations such as "gm", "Gm", or "GM" for grams could potentially lead to serious errors in health-care settings where accidentally transposing "gm" to "mg" (milligrams) could result in a 1,000 times dosage error. It is therefore important to use "g" as specified in the SI standard to avoid confusion or misunderstanding.
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“The counting-room maxims liberally expounded are laws of the Universe. The merchant’s economy is a coarse symbol of the soul’s economy. It is, to spend for power, and not for pleasure.”
—Ralph Waldo Emerson (1803–1882)