Open circle with a small solid dot in the middle, like a simple bullseye or radio-button style marker.
U+1F789EXTREMELY HEAVY WHITE CIRCLEU+1F78BROUND TARGETU+1F788VERY HEAVY WHITE CIRCLEU+1F78CBLACK TINY SQUAREU+1F787HEAVY WHITE CIRCLEU+1F78DBLACK SLIGHTLY SMALL SQUAREU+1F786BOLD WHITE CIRCLEU+1F78ELIGHT WHITE SQUAREU+1F785MEDIUM BOLD WHITE CIRCLEU+1F78FMEDIUM WHITE SQUAREU+1F784BLACK SLIGHTLY SMALL CIRCLEU+1F790BOLD WHITE SQUARE120 characters in the Geometric Shapes Extended Unicode block.
U+1F780BLACK LEFT-POINTING ISOSCELES RIGHT TRIANGLEU+1F781BLACK UP-POINTING ISOSCELES RIGHT TRIANGLEU+1F782BLACK RIGHT-POINTING ISOSCELES RIGHT TRIANGLEU+1F783BLACK DOWN-POINTING ISOSCELES RIGHT TRIANGLEU+1F784BLACK SLIGHTLY SMALL CIRCLEU+1F785MEDIUM BOLD WHITE CIRCLEU+1F786BOLD WHITE CIRCLEU+1F787HEAVY WHITE CIRCLEU+1F788VERY HEAVY WHITE CIRCLEU+1F789EXTREMELY HEAVY WHITE CIRCLEU+1F78AWHITE CIRCLE CONTAINING BLACK SMALL CIRCLEU+1F78BROUND TARGETU+1F78CBLACK TINY SQUAREU+1F78DBLACK SLIGHTLY SMALL SQUAREU+1F78ELIGHT WHITE SQUAREU+1F78FMEDIUM WHITE SQUAREU+1F790BOLD WHITE SQUAREU+1F791HEAVY WHITE SQUAREU+1F792VERY HEAVY WHITE SQUAREU+1F793EXTREMELY HEAVY WHITE SQUAREU+1F794WHITE SQUARE CONTAINING BLACK VERY SMALL SQUAREU+1F795WHITE SQUARE CONTAINING BLACK MEDIUM SQUAREU+1F796SQUARE TARGETU+1F797BLACK TINY DIAMONDU+1F798BLACK VERY SMALL DIAMONDU+1F799BLACK MEDIUM SMALL DIAMONDU+1F79AWHITE DIAMOND CONTAINING BLACK VERY SMALL DIAMONDU+1F79BWHITE DIAMOND CONTAINING BLACK MEDIUM DIAMONDU+1F79CDIAMOND TARGETU+1F79DBLACK TINY LOZENGEU+1F79EBLACK VERY SMALL LOZENGEU+1F79FBLACK MEDIUM SMALL LOZENGEU+1F7A0WHITE LOZENGE CONTAINING BLACK SMALL LOZENGEU+1F7A1THIN GREEK CROSSU+1F7A2LIGHT GREEK CROSSU+1F7A3MEDIUM GREEK CROSSU+1F7A4BOLD GREEK CROSSU+1F7A5VERY BOLD GREEK CROSSU+1F7A6VERY HEAVY GREEK CROSSU+1F7A7EXTREMELY HEAVY GREEK CROSSU+1F7A8THIN SALTIREU+1F7A9LIGHT SALTIREU+1F7AAMEDIUM SALTIREU+1F7ABBOLD SALTIREU+1F7ACHEAVY SALTIREU+1F7ADVERY HEAVY SALTIREU+1F7AEEXTREMELY HEAVY SALTIREU+1F7AFLIGHT FIVE SPOKED ASTERISKU+1F7B0MEDIUM FIVE SPOKED ASTERISKU+1F7B1BOLD FIVE SPOKED ASTERISKU+1F7B2HEAVY FIVE SPOKED ASTERISKU+1F7B3VERY HEAVY FIVE SPOKED ASTERISKU+1F7B4EXTREMELY HEAVY FIVE SPOKED ASTERISKU+1F7B5LIGHT SIX SPOKED ASTERISKU+1F7B6MEDIUM SIX SPOKED ASTERISKU+1F7B7BOLD SIX SPOKED ASTERISKU+1F7B8HEAVY SIX SPOKED ASTERISKU+1F7B9VERY HEAVY SIX SPOKED ASTERISKU+1F7BAEXTREMELY HEAVY SIX SPOKED ASTERISKU+1F7BBLIGHT EIGHT SPOKED ASTERISKU+1F7BCMEDIUM EIGHT SPOKED ASTERISKU+1F7BDBOLD EIGHT SPOKED ASTERISKU+1F7BEHEAVY EIGHT SPOKED ASTERISKU+1F7BFVERY HEAVY EIGHT SPOKED ASTERISKU+1F7C0LIGHT THREE POINTED BLACK STARU+1F7C1MEDIUM THREE POINTED BLACK STARU+1F7C2THREE POINTED BLACK STARU+1F7C3MEDIUM THREE POINTED PINWHEEL STARU+1F7C4LIGHT FOUR POINTED BLACK STARU+1F7C5MEDIUM FOUR POINTED BLACK STARU+1F7C6FOUR POINTED BLACK STARU+1F7C7MEDIUM FOUR POINTED PINWHEEL STARU+1F7C8REVERSE LIGHT FOUR POINTED PINWHEEL STARU+1F7C9LIGHT FIVE POINTED BLACK STARU+1F7CAHEAVY FIVE POINTED BLACK STARU+1F7CBMEDIUM SIX POINTED BLACK STARU+1F7CCHEAVY SIX POINTED BLACK STARU+1F7CDSIX POINTED PINWHEEL STARU+1F7CEMEDIUM EIGHT POINTED BLACK STARU+1F7CFHEAVY EIGHT POINTED BLACK STARU+1F7D0VERY HEAVY EIGHT POINTED BLACK STARU+1F7D1HEAVY EIGHT POINTED PINWHEEL STARU+1F7D2LIGHT TWELVE POINTED BLACK STARU+1F7D3HEAVY TWELVE POINTED BLACK STARU+1F7D4HEAVY TWELVE POINTED PINWHEEL STARU+1F7D5CIRCLED TRIANGLEU+1F7D6NEGATIVE CIRCLED TRIANGLEU+1F7D7CIRCLED SQUAREU+1F7D8NEGATIVE CIRCLED SQUAREU+1F7D9NINE POINTED WHITE STARU+1F7DABLACK CIRCLE WITH WHITE VERTICAL BARU+1F7DBBULLET IN DOUBLE CIRCLEU+1F7E0LARGE ORANGE CIRCLEU+1F7E1LARGE YELLOW CIRCLEU+1F7E2LARGE GREEN CIRCLEU+1F7E3LARGE PURPLE CIRCLEU+1F7E4LARGE BROWN CIRCLEU+1F7E5LARGE RED SQUAREU+1F7E6LARGE BLUE SQUAREU+1F7E7LARGE ORANGE SQUAREU+1F7E8LARGE YELLOW SQUAREU+1F7E9LARGE GREEN SQUAREU+1F7EALARGE PURPLE SQUAREU+1F7EBLARGE BROWN SQUAREU+1F7F0HEAVY EQUALS SIGNU+1F7F1CIRCLE WITH DOUBLE VERTICAL AND HORIZONTAL LINEU+1F7F2DOUBLE CIRCLE WITH DOUBLE HORIZONTAL LINEU+1F7F3CIRCLED BOTTOM RIGHT OBLIQUE HALF BLACK CIRCLEU+1F7F4LEFT HALF WHITE CIRCLEU+1F7F5RIGHT HALF WHITE CIRCLEU+1F7F6TRANSPARENT CUBEU+1F7F7WHITE CUBEU+1F7F8HORIZONTAL DOUBLE WHITE SMALL SQUAREU+1F7F9VERTICAL DOUBLE WHITE SMALL SQUAREU+1F7FAWHITE SQUARE WITH BOTTOM HALF BISECTEDU+1F7FBWHITE SQUARE WITH TOP HALF BISECTEDU+1F7FCWHITE SQUARE WITH HORIZONTAL AND VERTICAL BISECTING LINESU+1F7FDLOWER LEFT FLATTENED RIGHT TRIANGLEU+1F7FELOWER RIGHT FLATTENED RIGHT TRIANGLEU+1F7FFRHOMBUS