Por qué 'Muñoz' en negritas Unicode sale como 𝐌𝐮ñ𝐨𝐳: la ñ, los acentos y los generadores de texto

When you copy your name into a text generator for Instagram and it appears as 𝐌𝐮ñ𝐨𝐳 instead of all in bold, it's not a generator bug. It's a Unicode limitation that you need to understand to decide what to do with the text in Spanish. These fancy text generators don't change the typography; they swap each letter for a similar-looking character with a different style. Most of them come from the Mathematical Alphanumeric Symbols block (U+1D400–U+1D7FF):

- a (U+0061) becomes 𝐚 (U+1D41A, MATHEMATICAL BOLD SMALL A)

- A (U+0041) becomes 𝐀 (U+1D400, MATHEMATICAL BOLD CAPITAL A)

To create a bold version of the word "Muñoz", the code maps each character to its corresponding styled version from this block. The result is 𝐌𝐮ñ𝐨𝐳. However, there's no stylized ñ, e with accent, or u with umlaut in this block. That's why ñ, e with accent, and u remain as normal letters.

To achieve the bold effect, one might try decomposing the letter into its base and accent, then applying bold to the base alone. For example, é can be normalized to NFD (Compatibility Decomposition), which separates it into e (U+0065) and U+0301 (COMBINING ACUTE ACCENT). Applying bold to é + U+0301 works technically, but it has inconsistencies in rendering.

Many system fonts don't position the accent combining mark well over the mathematical style characters. This inconsistency can cause issues with search, copying, screen readers, and accessibility features like VoiceOver and TalkBack. The recommended approach is to keep the precomposed letters (e, ñ, ü) without any special style, as generators that handle this properly do.