Generate a simple flat vector hand icon for a rehabilitation game UI in exactly the same visual style as the reference icon. The hand should be rotated so the palm is viewed from an angled side/front perspective and posed as if performing a full power grip around an invisible therapy ball. All fingers should be curled inward together in a natural gripping position, with the thumb wrapping across the front of the fingers, clearly indicating that the hand is holding a spherical object. Do NOT draw the ball—only shape the hand around it. Keep the fingers simplified into clean grouped forms rather than detailed anatomy. Use a solid white fill with a clean medium-blue outline matching the reference. Rounded corners, consistent outline thickness, minimal detail, no realism, no texture, no gradients (or only extremely subtle flat shading if necessary), no background. The hand should be centered, isolated, and optimized for export as a clean SVG icon. The result should look like it belongs to the same 2D medical/rehabilitation game UI as the original icon.

The image shows a black and white line drawing of a hand with a ball in it, symbolizing the importance of protecting oneself and others.