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The Writer's Desk Book / Being a Reference Volume upon Questions of Punctuation, Capitalization, Spelling, Division of Words, Indention, Spacing, Italics, Abbreviations, Accents, Numerals, Faulty Diction, Letter Writing, Postal Regulations, Etc. cover

The Writer's Desk Book / Being a Reference Volume upon Questions of Punctuation, Capitalization, Spelling, Division of Words, Indention, Spacing, Italics, Abbreviations, Accents, Numerals, Faulty Diction, Letter Writing, Postal Regulations, Etc.

Chapter 61: 11. MATHEMATICAL SIGNS
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About This Book

This reference guides writers, editors, and printers through practical rules and examples for punctuation (comma, semicolon, colon, period, dash, quotation marks, parentheses, apostrophe), capitalization, spelling and variant forms, compound words, word division, indention and paragraphing, spacing and italics, abbreviations, numerals, faulty diction, letter writing, and postal regulations. Each section offers definitions, usage guidelines, and illustrative examples, with appendices on standard time, weights and measures, and foreign coin values, designed as a compact desk companion for drafting, editing, and preparing printed correspondence.

11. MATHEMATICAL SIGNS

+ Plus
Minus
± Plus or minus
Minus or plus
× Multiplied by13
÷ Divided by
= Equal to
Not equal to
Identical with
Not identical with
Congruent to
Greater than
Less than
The difference between
Is equivalent to
Integration
: and : : Proportion
Varies as
Approaches as a limit
Infinity
Therefore
Because
Continuation
The radical sign
Perpendicular to
Factorial sign
Parallel
Arc of circle
° Degree of circle
Minute of circle
Second of circle
Angle
Right angle
Square
Rectangle
Parallelogram
Triangle

13 This is also indicated algebraically by a dot, as, a · b

12. MEDICAL SIGNS

āā (ἀνά) of each
(Recipe) take
, i Ounce, one ounce
ss Half an ounce
iss One ounce and a half
ij Two ounces
Drachm
Scruple
(Octavius) Pint
Fluid ounce
Fluid drachm
m. Minim or drop