Symbian is a mobile operating system and software platform originally developed for smartphones. It was created by the Symbian Ltd., a consortium of several companies including Nokia, Ericsson, Panasonic, and others. The Symbian OS became prominent in the late 1990s and early 2000s and was widely used in mobile devices, particularly smartphones. Key features of Symbian include: 1. **Multitasking**: Symbian supports running multiple applications simultaneously.

SO(5) refers to the special orthogonal group in five dimensions. It is the group of all orthogonal 5x5 matrices with determinant 1.

Aztec mathematics refers to the mathematical practices and concepts used by the Aztec civilization, which flourished in central Mexico from the 14th to the 16th centuries. The Aztecs had a sophisticated understanding of mathematics, which they used for practical purposes in areas like agriculture, trade, astronomy, and construction.

In mathematics, particularly in the study of reflection groups and Coxeter groups, a **Coxeter element** is a specific type of element that is associated with the generating reflections of a Coxeter group. More formally, a Coxeter group is defined by a set of generators that satisfy certain relations, typically corresponding to reflections across hyperplanes in a geometric space. A Coxeter element is typically constructed by taking a set of generators of the Coxeter group and forming their product in a specific order.

Nuclear technology in China encompasses various aspects including the development, construction, and operation of nuclear power plants, research in nuclear science, and advancements in nuclear technology applications. China has made significant investments in nuclear energy as part of its strategy to diversify its energy sources, reduce reliance on fossil fuels, and address climate change. Here are some key points related to nuclear technology in China: 1. **Nuclear Power Plants**: China has rapidly expanded its fleet of nuclear reactors.