digital twin
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CG: n

CT: Digital twin (DT) is a virtual replica of a physical object, person, or process that can be used to increase understanding and perform tests. They are linked to real data sources in the environment and update in real time to reflect changes in the physical world.

Here are two examples that can help clarify what this means.

First, a wind turbine could be fitted with various sensors related to vital functionalities. These sensors would collect data about different aspects of the turbine’s performance, like its energy output and temperature and external factors like the weather. The processing system would receive this information and apply it to a digital copy. This would aid in monitoring the turbine in its environment and finding areas for improvement.

Second, a common example is Google Maps. Essentially, Google Maps is a DT of Earth’s surface. It is linked to real-time data on things like traffic and roadwork to help optimise your commute.

S: MDPI (last access: 21 January 2026)

N: 1. – digital (adj): mid-15c., “pertaining to numbers below ten;” 1650s, “pertaining to fingers,” from Latin digitalis, from digitus “finger or toe”. The numerical sense is because numerals under 10 were counted on fingers. Meaning “using numerical digits” is from 1938, especially of computers which run on data in the form of digits (opposed to analogue) after c. 1945. In reference to recording or broadcasting, from 1960.

– twin (n): From “twin”, adjective and noun.

Adjective: Old English twinn “consisting of two, twain, twofold, double, two-by-two,” from Proto-Germanic *twisnjaz “double” (source also of Old Norse tvinnr “double, twin,” Old Danish tvinling, Dutch tweeling, German zwillung), from PIE *dwisno- (source also of Latin bini “two each,” Lithuanian dvynu “twins”), from *dwi- “double,” from root *dwo- “two.”

Noun: c. 1300, “one of two children born at a single birth,” Middle English twin, earlier itwin, from Old English getwinn “double;” getwinnas “twins, two born at one birth,” from the adjective (see twin (adj.)).

By late 14c. in reference to animals, also the constellation Gemini (the Twins). The general sense of “pair linked together by particular relation or resemblance” is by 1580s. Another old word for “one of a pair of twins” was twinling (c. 1300).

2. Information Technology (Informatics): digital twin.

  • A digital twin is a [three-dimensional] representation of a real-world device. But rather than just [being] a static copy, a digital twin feeds live, real-time information about the actual physical product, which can be overlaid on top of the digital image.

3. Why is a digital twin important?

Digital twins play a crucial role in enhancing operational efficiency, predictive maintenance, and decision-making. Key benefits include:

  • Real-Time Monitoring: Provides continuous tracking and insights into physical assets.
  • Predictive Maintenance: Identifies potential failures before they occur, reducing downtime.
  • Improved Performance Optimization: Simulates a variety of scenarios to enhance efficiency and design.
  • Cost Reduction: Minimizes operational and maintenance costs through data-driven insights.
  • Better Decision-Making: Helps organizations make informed choices.

4. Do not confuse digital twin (DT) with building information modeling (BIM) or digital thread; they all have a lot to do with systems engineering but they are not the same thing.

  • The digital thread enables traceability over the entire life cycle of a product. This has been practiced in safety-critical industries for decades. In aviation and railroad technology in particular, this is mandatory and is an important driver of Product Lifecycle Management (PLM).
  • Building information modeling (BIM) is a process involving the generation and management of digital representations of physical and functional characteristics of places.
  • The digital twin (DT) is a model that represents the actual state of a system. The aim of the digital twin is to carry out activities on the model before they are carried out on the actual system. The range of possible activities depends heavily on the model.

5. Cultural Interrelation: We can mention the book The Digital Twin (2023) by Noel Crespi, Adam T. Drobot and Roberto Minerva.

S: 1. Etymonline – https://www.etymonline.com/search?q=digital, https://www.etymonline.com/search?q=twin (last access: 25 January 2026). 2. TERMIUM PLUS (last access: 25 January 2026). 3. Denodo (last access: 25 January 2026). 4. SET (last access: 25 January 2026); SABLONO (last access: 25 January 2026). 5. Amazon (last access: 25 January 2026).

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CR: aritificial intelligence, computer science, Internet, Internet of Things, metaverse.