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Through Cutting, Tool and Handle

While all scissors largely follow the same working principle, heavy-duty scissors intended for cutting tough materials tend to be called shears instead of scissors (e.g. pruning shears and grass shears), and some larger, two-handed implements are called trimmers instead (e.g. hedge trimmer). Choosing the optimal type of scissors/shears is crucial, as otherwise it can cause unwanted damage to the target material and/or the instrument itself. For example, hair-cutting shears and kitchen shears are functionally equivalent scissors, but hair-cutting shears have specific blade angles ideal for cutting heaped bundles of hair, and using the incorrect type of scissors will result in increased damage or split ends, or both, by breaking the hair; kitchen shears, also known as kitchen scissors, are intended for cutting and trimming tough food materials such as meat, tendon and bones. Surgical scissors, used to divide tissues and trim/reshape implants during surgical operations, have even a greater variety to deal with different anatomical and procedural circumstances.

Most scissors have a ringed handle to allow readily opening for repeated cutting, and some even have spring between the shanks to assist opening (especially for shears with straight handle). While historically inexpensive, mass-produced scissors often have bare metal handles, modern scissors are often designed ergonomically with composite thermoplastic and rubber covering on handles, which are more comfortable for the hand.

Terminology

The noun scissors is treated as a plural noun and therefore takes a plural verb (e.g., these scissors are). Alternatively, the tool is referred to by the singular phrase a pair of scissors. The word shears is used to describe similar instruments that are larger in size and for heavier cutting.

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