I see no shortcut key in Android Studio for "Find Word at Caret" (see 5th row below).
However when I searched IntelliJ IDEA documents I have found this.
I know the first option but I didn't understand the second one. What is N/A keyboard shortcut?
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In case of OS X it changes to N/A meaning simply: Not Available (or "not applicable").
<span class="menupath">Edit | Find | Find Word At Caret</span>. </li><li class="list__item"> Use <kbd data-default="Ctrl+F3" data-default_for_gnome="Ctrl+F3" data-default_for_kde="Ctrl+3" data-default_for_xwin="Ctrl+F3" data-emacs="Ctrl+F3" data-jbuilder="Ctrl+F3" data-visual_studio="Ctrl+F3" data-netbeans_6.5="N/A" data-eclipse="Ctrl+F12" data-mac_os_x_10.5_="N/A" data-mac_os_x="⌘F3" data-eclipse_mac_os_x="N/A" data-intellij_idea_classic_os_x="N/A" data-xcode="N/A" data-resharper="N/A" data-resharper_osx="N/A">Ctrl+F3</kbd> keyboard shortcut.
As for the shortcut itself you can create your own by going to System Preferences -> Keyboard -> Shortcuts.