LaTeX – A document preparation system - mathematical symbols (数学符号)

https://www.latex-project.org/

preparation [,prepə'reɪʃ(ə)n]：n. 预备，准备

LaTeX is a high-quality typesetting system; it includes features designed for the production of technical and scientific documentation. LaTeX is the de facto standard for the communication and publication of scientific documents. LaTeX is available as free software.

typesetting ['taɪp,sɛtɪŋ]：adj. 排字用的 n. 排字
de facto standard：事实标准，约定俗成的标准