• Section (botany)
  Section (botany)
  In botany, a section is a taxonomic rank below the genus, but above the species. The subgenus, if present, is higher than the section, and the rank of series, if present, is below the section. Sections are typically used to help organise very large genera, which may have hundreds of species...
  
  
• Section (music)
  Section (music)
  In music, a section is "a complete, but not independent musical idea". Types of sections include the introduction or intro, exposition, recapitulation, verse, chorus or refrain, conclusion, coda or outro, fadeout, bridge or interlude...
  
  
• Archaeological section
  Archaeological section
  In archaeology a section is a view in part of the archaeological sequence showing it in the vertical plane, as a cross section, and thereby illustrating its profile and stratigraphy. This may make it easier to view and interpret as it developed over time....
  
  
• Histological section
  Histological section
  Histological section refers to thin slices of tissue applied to a microscopic slide, usually around 5 to 10 micrometres thick, which are viewed under a microscope...
  
  , a thin slice of tissue used for microscopic examination
• Section, an instrumental group within an orchestra
• Memory segment
  Memory segment
  x86 memory segmentation refers to the implementation of memory segmentation on the x86 architecture. Memory is divided into portions that may be addressed by a single index register without changing a 16-bit segment selector. In real mode or V86 mode, a segment is always 64 kilobytes in size . In...
  
  , a division of computer memory
• Statigraphic section
  Statigraphic section
  A stratigraphic section is a sequence of layers of rocks in the order they were deposited....
  
  , layers of rocks
• Caesarean section
  Caesarean section
  A Caesarean section, is a surgical procedure in which one or more incisions are made through a mother's abdomen and uterus to deliver one or more babies, or, rarely, to remove a dead fetus...
  
  , method of child birth
• Pullman section, a type of sleeping car accommodation
• Sectioning, also known outside the United Kingdom as involuntary commitment

Writing

• Section (typography)
  Section (typography)
  In books and documents, a section is a subdivision, especially of a chapter.Sections are visually separated from each other with a section break, typically consisting of extra space between the sections...
  
  , a division of a chapter or document
  • Section sign
    Section sign
    The section sign , also called the "double S", "sectional symbol" or signum sectiōnis, is a typographical character used mainly to refer to a particular section of a document, such as a legal code. It is frequently used along with the pilcrow , or paragraph sign...
    
     (§), in typography
• Section (bookbinding)
  Section (bookbinding)
  In bookbinding, section refers to a group of bifolios, or sheets of paper, stacked together and folded in half. The term is sometimes used interchangeably with signature, though the latter technically refers only to the signature mark at the bottom of the first page of a printed section. The...
  
  , papers folded during bookbinding

Mathematics

• Section (category theory)
  Section (category theory)
  In category theory, a branch of mathematics, a section is a right inverse of a morphism. Dually, a retraction is a left inverse...
  
  , also in homological algebra, and including:
  • Section (fiber bundle)
    Section (fiber bundle)
    In the mathematical field of topology, a section of a fiber bundle π is a continuous right inverse of the function π...
    
    , in topology
  • Part of a sheaf (mathematics)
    Sheaf (mathematics)
    In mathematics, a sheaf is a tool for systematically tracking locally defined data attached to the open sets of a topological space. The data can be restricted to smaller open sets, and the data assigned to an open set is equivalent to all collections of compatible data assigned to collections of...
    
    
• Section (group theory)
  Section (group theory)
  In group theory a section of a group G is a group that is, or is isomorphic to, a quotient group of a subgroup of G.- Examples :Of the 26 sporadic groups, 20 are sections of the monster group, and are referred to as the "Happy Family"....
  
  

Land area

• Section (United States land surveying)
  Section (United States land surveying)
  In U.S. land surveying under the Public Land Survey System , a section is an area nominally one square mile, containing , with 36 sections making up one survey township on a rectangular grid....
  
   - (640 acres)
• Section of a Dominion Land Survey
  Dominion Land Survey
  The Dominion Land Survey is the method used to divide most of Western Canada into one-square-mile sections for agricultural and other purposes. It is based on the layout of the Public Land Survey System used in the United States, but has several differences...
  
   (Western Canada)
• Section as a part of the Alberta Township System
  Alberta Township System
  The Alberta Township System is a land surveying system used in the Canadian province of Alberta and other parts of western Canada.-History and background:...
  
  
• Forest section, a division of a forest range in India

Social organisations

• Section (Alpine club)
  Section (Alpine club)
  The section of an Alpine club is an independent club or society that, together with the other sections, forms the main organisation . Membership of an Alpine club is normally only possible through membership of a section...
  
  
• Section (military unit)
  Section (military unit)
  A section is a small military unit in some armies. In many armies, it is a squad of seven to twelve soldiers. However in France and armies based on the French model, it is the sub-division of a company .-Australian Army:...
  
  
• Section (Scouting)
• Section One, an elite, top-secret counter-terrorist organization in the television series La Femme Nikita

See also

• Cross section (disambiguation)
• Division (disambiguation)
• Part (disambiguation)
• Segment (disambiguation)