It means to name the shape that it looks like. Triangle, quadrilateral, pentagon, hexagon, etc.

A polygon is a many-sided shape. How many sides does it have? The first few are: 3 - Triangle 4 - Quadrilateral 5 - Pentagon 6 - Hexagon 7 - Septagon 8 - Octagon 9 - Nonagon 10 - Decagon

A polygon is a shape. So what they are asking is for you to name the shape in question

polly was here but now she's gone

"The word 'polygon' comes from Late Latin polygōnum (a noun), from Greek polygōnon/polugōnon πολύγωνον, noun use of neuter of polygōnos/polugōnos πολύγωνος (the masculine adjective), meaning "many-angled". Individual polygons are named (and sometimes classified) according to the number of sides, combining a Greek-derived numerical prefix with the suffix -gon, e.g. pentagon, dodecagon. The triangle, quadrilateral, and nonagon are exceptions. For large numbers, mathematicians usually write the numeral itself, e.g. 17-gon. A variable can even be used, usually n-gon. This is useful if the number of sides is used in a formula. Some special polygons also have their own names; for example, the regular star pentagon is also known as the pentagram. Polygon names Name Edges henagon (or monogon) 1 digon 2 triangle (or trigon) 3 quadrilateral (or tetragon) 4 pentagon 5 hexagon 6 heptagon (avoid "septagon" = Latin [sept-] + Greek) 7 octagon 8 enneagon (or nonagon) 9 decagon 10 hendecagon (avoid "undecagon" = Latin [un-] + Greek) 11 dodecagon (avoid "duodecagon" = Latin [duo-] + Greek) 12 tridecagon (or triskaidecagon) 13 tetradecagon (or tetrakaidecagon) 14 pentadecagon (or quindecagon or pentakaidecagon) 15 hexadecagon (or hexakaidecagon) 16 heptadecagon (or heptakaidecagon) 17 octadecagon (or octakaidecagon) 18 enneadecagon (or enneakaidecagon or nonadecagon) 19 icosagon 20 No established English name ("hectagon" is bad Greek, "centagon" is a Latin-Greek hybrid; neither is widely attested. 100 chiliagon 1000 myriagon 10,000 googolgon 10100 " Source and further information: http://en.wikipedia.org/wiki/Polygon#Naming_polygons