displaying icon in the header of the grid

You cannot display Appian's styled icons but you can display Unicode characters there. You can find them here - http://xahlee.info/comp/unicode_geometric_shapes.html

Don't just paste them directly rather use their code in the char() function. 

You cannot display Appian's styled icons but you can display Unicode characters there. You can find them here - http://xahlee.info/comp/unicode_geometric_shapes.html

Don't just paste them directly rather use their code in the char() function. 

Can you share some examples wher i can see how it is used?

a!gridColumn(
        label: concat(char(9925),"Column Header"),
        value: {}
      )