The "MT" stands for Monotype , the foundry that produced this specific cut of the font. It is often substituted for the generic "Symbol" font during PDF conversions or in specific software environments like Adobe Acrobat to ensure cross-platform compatibility. Review & User Experience Legibility
Symbol Mt Normal (often listed as Symbol MT in font menus) is a serif-based symbolic typeface designed to provide a comprehensive set of non-alphabetic characters, mathematical operators, Greek letters, and technical symbols. It is not a traditional text font for prose but rather a utility font for scientific, mathematical, and technical documentation. Symbol Mt Normal Font