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g:geometrical-characters

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+ *plus*, or *more*, the sign of addition; signifying that the numbers or quantities between which it is placed are to be added together.

- *minus*, or *less*, the sign of subtraction; signifying that the latter of the two quantities between which it is placed is to be taken from the former.

~ denotes the difference of two quantities when it is not known which is the greater.

X *into*, the sign of multiplication; signifying that the quantities between which it is placed are to be multiplied together.

÷ *by*, the sign of division; signifying that the former of the two quantities between which it is placed is to be divided by the latter.

: *as*, or *to*, :: *so is*, the sign of an equality of ratios; signifying that the quantities between which they are placed are proportional to each other.

= *equal to*, the sign of equality; signifying that the quantities between which it is placed are equal to each other.

√ the *radical sign*; signifying that the quantity before which it is placed is to have some root of it extracted. — *Bonnycastle's Geometry. 12mo*. 1823.

Formerly used to denote *equal to*, but is become obsolete.

△ Triangle; as △ ABC = △ ADC.

▭ Rectangled parallelogram.

—: The differences, or excess.

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