Математика. Числительные. Аристова В.М. - 23 стр.

             B as C is to D.
::           - the sign denotes the equality of two ratios (proportions) and can be substituted
             by the sign of equality = 2 : 4 :: 3 : 6 — two is to four equals (as) three is to six.
*            - a star, an asterisk
∴            - the sign means "therefore" — следовательно, поэтому, отсюда

Q            - the sign means "since, before" — так как.
#            - the sign has two kinds of nominations:
             1) it is the synonym of the abbriviation N., N(s), No (number(s)): # 3 (number
             three); 2) it means "pound" (фунт, как мера веса), if it stands after the numeral 3
             # (three pounds).
!,           - these signs in mathematics mean "factorial" 5! or           5 = 1×2×3×4×5=120 —
             five factorial
∝            - the sign means: to vary proportionally
+            - the sign of addition — plus
-            - the sign of subtraction — minus or negative
"            - plus or minus — плюс-минус
K            - minus or plus — минус-плюс
=            - the sign of equality, it is read: is, is equal to   , equals, makes
≠            - is read: is not equal to      , is not.
—            - a dash — тире
/            - a slash — наклонная черта
≈,Т, С, -.   - the signs means: approximately equals, is approximately equal to         — прибли-
             зительно, почти равен
>            - is greater than, includes — более чем, больше; включает
е            - is not greater than     — не более чем,

<            - is less than, is included — менее чем, меньше; включено
г            - is not less than      — не менее чем,

≥            - is equal to    or greater than      — равно или более
≤            - is equal to    or less than     — равно или менее
4            - the sign denotes infinity — бесконечность
→            - the signs mean: approaches, tends to — достигает, стремится к

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