Lists of mathematical symbols can be found online at Wikepedia, Rapid Tables, PSU website, Binghamton, Radio Electronics, Nikhef, J.D. Fielder, and Wikibooks.
An expression.
A stock symbol is an abbreviation, typically of up to four characters, which uniquely identifies a share which is traded on a stock exchange. A list of NYSE stock symbols can be found on the EODData website.
The symbol that means 'results in' is the equals sign. It is one of the most common and recognizable mathematical symbols.
Go to Insert Symbol. From there you can go through the character sets and you will find the square root symbol. You could also get it in the Character Map and then copy and paste it into Powerpoint.
One can find a list of all Mehndi songs at their Wikipedia page. They have a full list of songs. This is where one can find a list of all Mehndi songs.
One might find the mathematical equation for the surface area of a sphere in a mathematics textbook. One might also find the equation at online math study groups.
A formula is a mathematical relationship or rule expressed in symbols. One of the most famous is E = mc squared
Maps have legends. A map legend is an explanation of the symbols on the map. If one cannot find the legend on a map, one is unlikely to find anything else on it.
Flowchart symbols are important, but can be confusing. One might use BreezeTree as a way to determine the correct meanings and explanations of these symbols.
One can find pictures of radiation symbols online at Wikipedia. One can also find pictures at Photo Bucket, News CNET, Clker, EPA, Foto Search and Public Domain Pictures.
There are many places where one can find a list of Hindi fonts. One can find a list of Hindi fonts at popular on the web sources such as Microsoft and OneIndia.
You are probably referring to an "equal to" sign (=). This sign makes one side of the equation equal to the other.