Factor

Factor, a Latin word meaning "who/which acts", may refer to:

Commerce

Factor (agent), a person who acts for another, notably a mercantile and colonial agent
Factor (Scotland), a person or firm managing a Scottish estate
Factors of production, a resource used in the production of goods and services
Factoring (finance), an entity providing commercial finance services

Factor B and factor D, peptides involved in the alternate pathway of immune system complement activation
Coagulation factors, substances essential for blood coagulation
Environmental factor, any abiotic or biotic factor that affects life
An enzyme, proteins that catalyze chemical reactions
Transcription factor, a protein that binds to specific DNA sequences

Authentication factor, a piece of information used to verify a person's identity for security purposes
Factor (programming language), a concatenative stack-oriented programming language
A substring, a subsequence of consecutive symbols in a string
Decomposition (computer science), also known as factoring, the organization of computer code
Factor (Unix), a utility for factoring an integer into its prime factors.

Sun protection factor, a unit describing reduction in transmitted ultraviolet light
Human factors, a profession that focuses on how people interact with products, tools, or procedures.
In the design of experiments, a phenomenon presumed to affect an experiment

A term in multiplication
Divisor, an integer which evenly divides a number without leaving a remainder
Factorization, the decomposition of an object into a product of other objects
Integer factorization, the process of breaking down a composite number into smaller non-trivial divisors
A coefficient, a multiplicative factor in an expression, usually a number
The act of forming a factor group or quotient ring in abstract algebra
A von Neumann algebra with a trivial center
Factor (graph theory), a spanning subgraph
Any finite contiguous subsequence of a word

An independent variable, either categorical or continuous, controlled by the experimenter. However, "factor" is sometimes used synonymously with categorical variable, regardless whether it is controlled.
Factor analysis is the study of how factors or certain variables affect other variables