Two other commonly used representational allegories of yin and yang are water and fire.

Two of the first commonly noted human civilizations began near the eastern Mediterranean sea.

Two architectural models are commonly used to describe the protocols and methods used in internetworking.

Two of the most commonly studied model organisms are invertebrates: the fruit fly Drosophila melanogaster and the nematode Caenorhabditis elegans.

Two knitted fabrics can be joined by embroidery-based grafting methods, most commonly the Kitchener stitch.

Two encapsulated forms of PPP, Point-to-Point Protocol over Ethernet ( PPPoE ) and Point-to-Point Protocol over ATM ( PPPoA ), are used most commonly by Internet Service Providers ( ISPs ) to establish a Digital Subscriber Line ( DSL ) Internet service connection with customers.

Two energies of radiation are commonly differentiated by the way they interact with normal chemical matter: ionizing and non-ionizing radiation.

Two other acronyms commonly used in the community are FIAWOL ( Fandom Is A Way Of Life ) and its opposite FIJAGH ( Fandom Is Just A Goddamned Hobby ) to describe two ways of looking at the place of fandom in one's life.

Two of the most significant of these are the Yad Ramah by Rabbi Meir Abulafia ( uncle of the mystic Abraham Abulafia ) and Bet Habechirah by Rabbi Menahem haMeiri, commonly referred to as " Meiri ".

Two methods are commonly used for applying mandatory access control:

Two general types of ground glass joints are fairly commonly used: joints that are slightly conically-tapered and ball and socket joints ( sometimes called spherical joints ).

Two barrel and four barrel configurations are commonly used to accommodate the higher air flow rate with large engine displacement.

Two commonly used HBTs are silicon – germanium and aluminum gallium arsenide, though a wide variety of semiconductors may be used for the HBT structure.

Two shortened variations, " Bucs " and " Buccos ", are also commonly used for both the American football team and MLB's Pittsburgh Pirates, and the Reading Buccaneers Drum and Bugle Corps.

Two other sets of units, Gaussian and CGS-EMU, are the same for magnetic properties and are commonly used in physics.

Two areas of the cortex are commonly referred to as motor:

Two broad categories of aggression are commonly distinguished.

Two kinds of papayas are commonly grown.

Two types of self are commonly considered-the self that is the ego, also called the learned, superficial self of mind and body, an egoic creation, and the Self which is sometimes called the " True Self ", the " Observing Self ", or the " Witness ".

Two methods are most commonly employed when attempting to perform The Shrew while still remaining faithful to the text.

Two forms of blood tests are commonly done:

Two examples are most commonly cited: the insistence of Indian and Northern Affairs ’ representatives that the Naskapis live in row houses that, in the event, proved not to be adequately soundproofed and that had a variety of other faults ; and the fact that the brochure prepared by Indian and Northern Affairs showed a fully landscaped site with trees and bushes, whereas no landscaping was done, and no trees or bushes were ever planted.

Two commonly made observations supported the idea that the Earth was the center of the Universe.

Two variations of demand reduction are commonly cited ; one being access rate, the other diversion.

Two types of light source were used, a thousand watt projection lamp and an AH6 high pressure mercury arc.

Two types of punched cards used to program the machine.

* Charles Dickens used Selkirk as a simile in Chapter Two of The Pickwick Papers: " Colonel Builder and Sir Thomas Clubber exchanged snuff – boxes, and looked very much like a pair of Alexander Selkirks — ' Monarchs of all they surveyed.

Two cost models are generally used:

Two other uncommon sources were promoted by Alexander: Anselm of Canterbury, whose writings had been ignored for almost a century gained an important advocate in Alexander and he used Anselm's works extensively in his teaching on Christology and soteriology ; and, Pseudo-Dionysius the Areopagite, whom Alexander used in his examination of the theology of Orders and ecclesiastical structures.

Two images are used to convey this idea.

* Brake equipment: Two main types are used: brake shoes that are pressed against the tread of the wheel, and disc brakes and pads.

Two common bookkeeping systems used by businesses and other organizations are the single-entry bookkeeping system and the double-entry bookkeeping system.

It was used to animate the face of Gollum in the movie Lord of the Rings: The Two Towers.

Examples include Lock, Stock and Two Smoking Barrels ( 1998 ) ( wherein the slang is translated via subtitles in one scene ); The Limey ( 1999 ); Sexy Beast ( 2000 ); Snatch ( 2000 ); Ocean's Eleven ( 2001 ); and Austin Powers in Goldmember ( 2002 ); It's All Gone Pete Tong ( 2004 ), after BBC radio disc jockey Pete Tong whose name is used in this context as rhyming slang for " wrong "; Green Street Hooligans ( 2005 ).

Sometimes used as a symbol for Christian marriage: Two gold wedding rings interlinked with the Greek letters Chi ( letter ) | chi ( X ) and Rho ( letter ) | rho ( P )— the first two letters in the Greek word for " Christ " ( see Labarum )

Two important principles of constraint-induced aphasia therapy are that treatment is very intense, with sessions lasting for up to 6 hours over the course of 10 days and that language is used in a communication context in which it is closely linked to ( nonverbal ) actions.

Two unique features set systems engineering apart from other engineering disciplines: ( 1 ) the particular attention devoted to both the physical processes involved and to the decision making components of the industrial environment, and ( 2 ) the wide scope applicability of its systems methodology, not limited to manufacturing industries, but effectively used in all kinds of business organizations.

Formula 3000 replaced Formula Two, and was so named because the engines used initially were 3. 0 L ( 183ci ) Cosworth DFV engines made obsolete by popularization of 1. 5 L turbocharged engines in Formula One.

Two or more glyphs which have the same significance, whether used interchangeably or chosen depending on context, are called allographs of each other.

Two sizes of primer pocket uniformer tools exist, the larger one is for large rifle ( 0. 130-inch nominal depth ) primer pockets and the smaller one is used for uniforming small rifle / pistol primer pockets.

The Ich bin ein Berliner speech is in part derived from a speech Kennedy gave at a Civic Reception on May 4, 1962, in New Orleans ; there also he used the phrase civis Romanus sum by saying " Two thousand years ago the proudest boast was to say, " I am a citizen of Rome.

Two witnesses who had originally testified in her grand jury indictment had died by the time she was found and brought to trial: a plumber who had sold materials used in the bomb had picked Soliah out of a lineup as one of the buyers, and a bomb expert had stated the explosive could have been built in Soliah's apartment.

Two implementations of KRC were written: David Turner's original one in BCPL running on EMAS, and Simon Croft's later one in C under Unix, and KRC was the main language used for teaching functional programming at the University of Kent at Canterbury ( UK ) from 1982 to 1985.

During World War Two, the tower was used as a look out tower by the home guard.

* Two other words for love in the Greek language, eros ( sexual love ) and storge ( child-to-parent love ), were never used in the New Testament.