Shark Fin Shears

shark fin
Shark Fin is the peak which has the triangular shape of a shark fin when viewed from the south.
A curled corner or lap in a membrane.
an upward-curled felt side lap or end lap.

shears
The Shears (Hada plebeja) is a moth of the family Noctuidae. It is found in Europe.
Glassmakers scissors that are used for the cutting, trimming and shaping of hot glass.  Usually very primitive in design with heavy gage steel.
A cutting instrument in which two blades move past each other, like scissors but typically larger
large scissors with strong blades