Is there is a library for invoking math symbols/formula(not sure what to call), which are design specifically to be added in a websites called maybe in html, php or javascri
It's not a library, except in the loosest sense, but if you happen to mean mathematical symbols for webpages (which can be combined to create formulae) you could start with the World Wide Web Consortium's Character entity references for HTML 4
It's not clear what you meant when you referred to the 'button bar above.'
jsMath looks like a good solution, the results look good and it has broad support, though it's still dependent on local fonts and browswers. There's also MathML, but support for this seems to be too thin.
I use this website to develop quizzes which can use math symbols. Which contain built in math function.
http://docs.moodle.org/en/Dragmath
thank you all.
Checkout Mathjax to write math symbols to web pages