Unkown applet in the panel

[Ma_N0]

Hi to all,

What's the app marked by the circle in the attached screenshot?

It shows two arrows, a "9" and an "A". When I click on it nothing happens: neither right nor left click have any effect.

Thanks.
Regards.

[mendy]

Scroll and numlock indicator activated in mate tweaks for keyboards without them.

[Ma_N0]

Thank you so much for your support.
Quite strange way to show it was a keybord led indicator...