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Important notice

Good news! We have updated our writing tools. Writing Tips and The Canadian Style have been combined to create a new tool called Writing Tips Plus.

Don’t forget to update your bookmarks. Within a few weeks, Writing Tips will no longer be available.

To begin your search, go to the alphabetical index below and click on the first letter of the word you are searching for.

abbreviations: scientific and technical terms

There is a vast array of technical and scientific abbreviations, such as those for mathematical ratios and operations, physical quantities and constants, or statistical formulas and notations.

Most unabridged dictionaries list such abbreviations. People working in specific disciplines should consult the appropriate manuals in their field.

(For a comprehensive list of such abbreviations, see ABBR: Abbreviations for Scientific and Engineering Terms.)


In biology, the Latin name for a genus is not abbreviated if used alone.

  • Clematis (genus)

When used with the species name, the name of the genus is abbreviated after the first reference. The species name is not abbreviated, however:

  • Clematis virginiana (full scientific name at first reference)
  • C. virginiana (second and subsequent references)


In symbols for chemical elements, compounds and formulas, use subscript, not superscript, numerals: H2SO4, SO2.