twin

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twin

1. 
a. either of two persons or animals conceived at the same time
b. (as modifier): a twin brother
2. a crystal consisting of two parts each of which has a definite orientation to the other
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

twin

[′twin]
(biology)
One of two individuals born at the same time.
(crystallography)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

digital twin

(1) A digital representation of a person. A digital twin is more realistic than an avatar, which is typically a cartoon-like character. See avatar.

(2) A digital representation of a real-world object. For example, a computer-aided design (CAD) drawing of a part or product is its digital twin. See CAD.

(3) A real-time representation of an industrial device. A digital twin is more than just a control panel that monitors a sensor or machine. It is a graphical replica of the specific device as it is performing in real time, and adjustments can be simulated on the twin to determine their effect before they are implemented in the field. See IoT.
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