Some streamlined or pirated versions of Windows omitted symbol.ttf to save space. If the physical font file is missing, the alias is useless.
Solution: This error is common in old Visual Basic 6 applications. Install the "Legacy Symbol Font" from Windows Features or copy symbol.ttf from a backup. Symbolmt-normal Font
When a document built on the Symbol font’s custom encoding (where 0x6D maps to ∫ instead of 'm') is copied into a modern UTF-8 environment, the raw byte values are misinterpreted, resulting in gibberish. Some streamlined or pirated versions of Windows omitted
Solution: Your CSS likely specifies font-family: Symbolmt-normal, which is not a valid web font. Change it to font-family: 'Segoe UI Symbol', 'Apple Symbols', 'Noto Sans', sans-serif; the raw byte values are misinterpreted