(adsbygoogle = window.adsbygoogle || []).push({}); What's that symbol????

Today we've studied in the electrodynamique an affector named dalamperes affector defined as:

[tex]\nabla^2 - \frac{1}{c^2}\cdot\frac{\partial^2}{\partial t^2}[/tex]

c is the speed of light in vacuum, t is time, [tex]\nabla[/tex] is hameltons affector,

HERE IS THE QUESTION:

What's the name of the symbol used in that affector, the symbol is like a square and has the second degree, and does it have a definition for the first degree? and what is it? can some one explain everything about it?

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# What's that symbol?

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