A Square as a mathematical symbol/operator

[rebeka]

I am pretty well familiar with most operators, but a square I am not so sure about. I've been trying to find a link to a complete list of currently used mathematical symbols online but I haven't found one. Could somebody please help me out. Thx...

 

[slider142]

The d'Alembertian is usually denoted by a square in physics texts.

 

[CRGreathouse]

Steinhaus' polygon notation is usually represented as a square with an infix argument.

 

[rebeka]

I do believe it would be the d'Alembert Operator as it is an equation relating to time dependent oscillations in three dimensional space...

Thanx a bunch