How to activate a "clickable" icon?

[Linux for blind general discussion]

Hi,
While online I was on a site that has like a filter your options segment. It is 
a clickable icon that says "filter, clickable". 
It is not a link, and not a button. It is simply a clickable icon that says 
"filter, clickable".
On Windows with NVDA, I can press enter on the clickable icon  and it will open 
up the choices.
But on Linux Mint MATE with Orca, when I press enter or space on the 
"clickable" icon, it does nothing.
Do you guys know if there is a special key combination to activate "clickable" 
regions that are not links, not buttons, just clickable icons?
Thanks,
SL
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