Symbol | Symbol Name | Meaning / definition | Example |
= | equals sign | equality | 5 = 2+3 5 is equal to 2+3 |
≠ | not equal sign | inequality | 5 ≠ 4 5 is not equal to 4 |
≈ | approximately equal | approximation | sin(0.01) ≈ 0.01, x ≈ y means x is approximately equal to y |
> | strict inequality | greater than | 5 > 4 5 is greater than 4 |
< | strict inequality | less than | 4 < 5 4 is less than 5 |
≥ | inequality | greater than or equal to | 5 ≥ 4, x ≥ y means x is greater than or equal to y |
≤ | inequality | less than or equal to | 4 ≤ 5, x ≤ y means x is greater than or equal to y |
( ) | parentheses | calculate expression inside first | 2 × (3+5) = 16 |
[ ] | brackets | calculate expression inside first | [(1+2)×(1+5)] = 18 |
+ | plus sign | addition | 1 + 1 = 2 |
− | minus sign | subtraction | 2 − 1 = 1 |
± | plus – minus | both plus and minus operations | 3 ± 5 = 8 and -2 |
± | minus – plus | both minus and plus operations | 3 ± 5 = -2 and 8 |
* | asterisk | multiplication | 2 * 3 = 6 |
× | times sign | multiplication | 2 × 3 = 6 |
· | multiplication dot | multiplication | 2 · 3 = 6 |
÷ | division sign / obelus | division | 6 ÷ 2 = 3 |
/ | division slash | division | 6 / 2 = 3 |
– | horizontal line | division / fraction | |
mod | modulo | remainder calculation | 7 mod 2 = 1 |
. | period | decimal point, decimal separator | 2.56 = 2+56/100 |
a^{b} | power | exponent | 2^{3}^{ }= 8 |
a^b | caret | exponent | 2 ^ 3^{ }= 8 |
√a | square root | √a · √a = a | √9 = ±3 |
^{3}√a | cube root | ^{3}√a · ^{3}√a · ^{3}√a = a | ^{3}√8 = 2 |
^{4}√a | fourth root | ^{4}√a · ^{4}√a · ^{4}√a · ^{4}√a = a | ^{4}√16 = ±2 |
^{n}√a | n-th root (radical) | for n=3, ^{n}√8 = 2 | |
% | percent | 1% = 1/100 | 10% × 30 = 3 |
‰ | per-mille | 1‰ = 1/1000 = 0.1% | 10‰ × 30 = 0.3 |
ppm | per-million | 1ppm = 1/1000000 | 10ppm × 30 = 0.0003 |
ppb | per-billion | 1ppb = 1/1000000000 | 10ppb × 30 = 3×10^{-7} |
ppt | per-trillion | 1ppt = 10^{-12} | 10ppt × 30 = 3×10^{-10} |
Emmanuel Abara Benson
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