**: Category: Diarylmethane dyes, based on diphenyl methane

**: Category: Triarylmethane dyes, derivates of triphenyl methane

**: Category: Azin dyes

**: Category: Indophenol dyes, derivates of indophenol

**: Category: Oxazin dyes, derivates of oxazin

**: Category: Thiazin dyes, derivatives of thiazin

**: Category: Fluorone dyes, based on fluorone

** commons: Category: CommonsRoot

** Hurricane Opal makes landfall at Pensacola Beach, Florida as a Category 3 hurricane with winds.

** U. K. Home Secretary Merlyn Rees ends Special Category Status for those sentenced for scheduled terrorist crimes relating to the civil violence in Northern Ireland.

**: Category: Phonetic alphabets: lists other phonetic transcription systems

**: Category: Spelling alphabets: lists other spelling alphabets

** Any of several hurricanes listed at List of Category 5 Atlantic hurricanes or List of Category 5 Pacific hurricanes

** Category of small categories

** Category of sets

** Category ( topology ) in the context of Baire spaces

** Category: Ecozones

** Category: Ecoregions

** Category: Ecosystems

**: Category: People educated at St John's School, Leatherhead, a former pupil at St. John's School, Leatherhead, England

**: Category: People educated at Hurstpierpoint College, a former pupil at Hurstpierpoint College, England

** Category III A – A precision instrument approach and landing with:

** Category III B – A precision instrument approach and landing with:

** Ab, the category of abelian groups

** Commutative semigroup, commutative monoid, abelian group, and commutative ring, algebraic structures with the commutative property

** Ab, the category of abelian groups, with the group of integers Z serving as the unit.

** free abelian group

** By the fundamental theorem of finitely generated abelian groups, it follows that abelian groups are amenable.

** The additive groups of R and C are isomorphic.

** the classical Lie groups, namely the simple groups related to the projective special linear, unitary, symplectic, or orthogonal transformations over a finite field ;

** the exceptional and twisted groups of Lie type ( including the Tits group ).

** 4 quad characters ; groups of four characters displayed in a row

** Functional groups

** Major climate groups

** Publics – groups of individuals

** The public ( a. k. a. " the general public ") – the totality of such groups.

** the product of groups, and also the semidirect product, knit product and wreath product,

** the free product of groups

** The self-description of many Salafi and Wahhabi groups

** Finite groups

** Polycyclic groups

** Negatively curved groups

** Euclidean groups

** Coxeter groups

** Braid groups

** Geometrically finite groups

** Finitely presented simple groups.

** Fundamental groups of closed orientable two-dimensional manifolds.

** In 1999, the North Atlantic Treaty Organization ( NATO ) led by the United States launched air attacks against Yugoslavia ( then composed of only Serbia and Montenegro ) to pressure the Yugoslav government to end its military operations against ethnic Albanian separatists in Kosovo due to accusations of war crimes being committed by Yugoslav military forces working alongside nationalist Serb paramilitary groups.

** Civil war in Chad ( 2005 – present ) – involved Chadian government forces and several Chadian rebel groups.

** Fosse Ardeatine massacre: 335 Italians are killed, including 75 Jews and over 200 members of the Italian Resistance from various groups, in Rome.

** The United States places an embargo on Libyan oil imports, alleging Libyan support for terrorist groups.