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Math Symbols
© 2006 RogueTurtle.com
If you have forgotten what they mean...
Or never knew what they were in the first place...
New math - Bah, Humbug! Unfortunately, more and more technical articles are being written by people with a newer education than I possess. In the 1950's, there was no such thing as <. I know there wasn't because I was there and I paid (at least a little) attention. Ok, Ok, I did really poor in math, but I know that sometime during those horrible years of 2 + 2 = 4, I would have remembered <.
Heck, I would have used it because it is charmingly "vague". What is 3 + 5 - 1? My answer: < 4. I'm right, up to a point. Ok, technically it's wrong, but you get my drift. New signs and symbols are used now that I never learned and if I did ever learn, I have forgotten.
π: I remember this one because when we first learned it I thought we were having Greek food in school. I didn't find out I was wrong for 6 more grade levels. What's it for, anyway?
Here's a cheat sheet for all of you out there who use such things. I know there are more of us out there than admit to it. Come on, print it out and hide it. I won't tell.
Symbol | What it is | How it is read | How it is used | Sample |
* | Multiplication | Times | Product of two values | 3 x 5 = 15 |
• | Multiplication | Times | Product of two values | 3 • 5 = 15 |
± | Plus/minus sign | Plus or minus | Expression of range, error or tolerance | 500 kbps ± 10% |
/ | Slash | Divided by Over | Division | 3 / 4 = 0.75 |
÷ | Division Sign | Divided by | Division | 3 ÷ 4 = 0.75 |
~ | Similarity Sign | Is similar to | Indicates 2 objects are geometrically similar | ABC ~ DEF |
< | Inequality sign | Is less than | Indicates left value is smaller than right value | 3 < 5,
X < Y |
≤ | Inequality sign | Is less than or equal to...
Is at most equal to | Indicates left value is smaller than or equal to right value | X ≤ Y |
> | Inequality sign | Is greater than | Indicates value on left is larger than value on right | 5 > 3,
X > Y |
≥ | Inequality sign | Is greater than or equal to | Indicates left value is larger than or equal to right value | X ≥ Y
| π | Greek pi (lowercase) | pi | General science | π = 3.14159... |
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