String art is
a graphic art characterized by an arrangement of colored straight line segments between points to form abstract geometric patterns.
Thread, wire, or string is wound around a grid of nails hammered into a velvet-covered wooden board.
Though straight lines are formed by the string, the slightly different angles and metric positions at
which strings intersect gives the appearance of Bezier curves.
Quadratic Bezier curve are obtained from strings based on two intersecting segments. String art has its origins in the 'curve stitch' activities invented by Mary Everest Boole to make mathematical ideas more accessible to children. Source: Wikipedia: String art.
Geometric art is a form of art based on the use and application of geometric figures. A geometric figure is any set or combination of points, lines, surfaces and solids.
A mobile app or mobile application software is a computer program designed to run on smartphones and tablet computers.