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An X mark is a mark used to indicate the concept of negation (for example "no, this has not been verified" or "no, I don't agree") as well as an in...
In mathematics, a square root of a number a is a number y such that y2 = a; in other words, a number y whose square (the result of multiplying the ...
In addition to being the 18th letter of the Greek alphabet, sigma also means 'sum' and 'deviation' in themathematics world.
The plus sign is written as a cross of horizontal and vertical lines: + The plus sign indicates addition operation of 2 numbers or expressions.
It is approximately equal to 3.14159. It has been represented by the Greek letter "π" since the mid-18th century, though it is also sometimes spell...
The triangular Deathly Hallows symbol is comprised of theElder Wand, the Resurrection Stone and the Cloak of Invisibility. Whoever possesses all th...
Tsunami hazard zone.
The stop sign is a sign which is often met at crossroads, when a road does not have traffic lights.
A power symbol is a symbol indicating that a control activates or deactivates a particular device.
Avert unnecessary u turn & secure drivers, pedestrians from accident by putting no u turn signs, no left turn or right turn signs.
For places where taking pictures are not allowed.
No smoking signs are a useful tool to enforce no smoking regulations.