After my talk about TeX syntax-highlighting font at TUG2025 conference, then vice-president of TeX Users Group, Boris Veytsman approached me with a proposal to develop a Math counterpart for the beautiful Arsenal font designed by Andrij Shevchenko.What followed was a deep dive into the TeXbook to learn about math font parameters, OpenType Math specification, and related documentation & resources. Fortunately, FontForge has really good support for editing Math tables; and the base font used (KpMath-Sans by Daniel Flippo) already had all the critical parameters set (which needed slight adjustments). I started the development of Arsenal Math by integrating the glyphs for Latin letters, Arabic numerals, some symbols etc. and with proper scaling & stem thickness corrections, for regular, bold, italic and bolditalic variants, plus math calligraphic letters. In addition, a lot of Math kerning (known as ‘cut-ins’ in OpenType parlance) was added to improve the spacing.Fig. 1: Arsenal Math specimen, contributed by CVR.Being an OpenType font — XeTeX, LuaTeX or some Unicode math typesetting engine (e.g. MS Word) is required to use Arsenal Math. Boris did testing and provided many feedback, and Vaishnavy Murthy graciously reviewed the glyph changes I made. The CTAN admins were quite helpful to get the font accepted into the repository. There is a style file and fontspec file supplied with the fonts to make the usage easy. The sources are available at RIT fonts repository.Boris also donated funding for the project, but he had already paid me many folds be mailing The TeXbook autographed by Donald Knuth for me, so I requested the LaTeX devfund team to use it for another project. Karl Berry suggested to write an article about the development process, which is published in the issue 46:3 of the TUGboat journal, and has a lot more technical details.Fig. 2: The TeXbook autographed by Don Knuth for me.The learning experience of Math typesetting internals, and contributing to the TeX ecosystem has been a fulfilling spare-time work for me in 2025. Many thanks to all those involved!