Overlap window icon, two offset overlapping windows, like the restore down button that unmaximizes a window.
768 characters in the Miscellaneous Symbols and Pictographs Unicode block, from number 728.
U+1F5D7OVERLAPU+1F5D8CLOCKWISE RIGHT AND LEFT SEMICIRCLE ARROWSU+1F5D9CANCELLATION XU+1F5DAINCREASE FONT SIZE SYMBOLU+1F5DBDECREASE FONT SIZE SYMBOLU+1F5DCCOMPRESSIONU+1F5DDOLD KEYU+1F5DEROLLED-UP NEWSPAPERU+1F5DFPAGE WITH CIRCLED TEXTU+1F5E0STOCK CHARTU+1F5E1DAGGER KNIFEU+1F5E2LIPSU+1F5E3SPEAKING HEAD IN SILHOUETTEU+1F5E4THREE RAYS ABOVEU+1F5E5THREE RAYS BELOWU+1F5E6THREE RAYS LEFTU+1F5E7THREE RAYS RIGHTU+1F5E8LEFT SPEECH BUBBLEU+1F5E9RIGHT SPEECH BUBBLEU+1F5EATWO SPEECH BUBBLESU+1F5EBTHREE SPEECH BUBBLESU+1F5ECLEFT THOUGHT BUBBLEU+1F5EDRIGHT THOUGHT BUBBLEU+1F5EELEFT ANGER BUBBLEU+1F5EFRIGHT ANGER BUBBLEU+1F5F0MOOD BUBBLEU+1F5F1LIGHTNING MOOD BUBBLEU+1F5F2LIGHTNING MOODU+1F5F3BALLOT BOX WITH BALLOTU+1F5F4BALLOT SCRIPT XU+1F5F5BALLOT BOX WITH SCRIPT XU+1F5F6BALLOT BOLD SCRIPT XU+1F5F7BALLOT BOX WITH BOLD SCRIPT XU+1F5F8LIGHT CHECK MARKU+1F5F9BALLOT BOX WITH BOLD CHECKU+1F5FAWORLD MAPU+1F5FBMOUNT FUJIU+1F5FCTOKYO TOWERU+1F5FDSTATUE OF LIBERTYU+1F5FESILHOUETTE OF JAPANU+1F5FFMOYAI