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The English name of a long compound word is involved in this writing. What principles should be followed if you want to abbreviate it into a symbol composed of several letters?
If it has been approved, there is no problem. If there is no precedent, the usual method is to write it all out when the article first appears, and then put the abbreviations in brackets. For example, the standard deviation (sd) can be shortened in future articles.

As for the law of shorthand, the first letter of each word is usually chosen.