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This question already has an answer here:

Recently, the following indicator appeared in the top bar (see screenshot below, I'm running Freya). I can't get any option or other information by clicking on it, the menu bubble is empty. Thanks for any help.

enter image description here

marked as duplicate by user170, png2378, r3bl, Suici Doga, Rafael Jul 12 '16 at 9:35

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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Do you have Dropbox installed? In the last weeks there were several problems with its indicator. Have a look on How can I fix this strange icon in wingpanel? and mark this question as duplicate if this solves your problem.

If not the second answer can help you finding out what app is behind this indicator.

Here is the command (thanks to @bitseater):

dbus-send --type=method_call --print-reply --dest=com.canonical.indicator.application /com/canonical/indicator/application/service com.canonical.indicator.application.service.GetApplications | grep "object path"

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