Copy the exact output for F/f, check its Unicode code point, and see whether this style preserves case or maps both forms to one symbol.
𝔽Input: uppercase F
𝕗Input: lowercase f
Case behavior: Uppercase F maps to 𝔽 and lowercase f maps to 𝕗. The two cases remain distinct in this style.
Unicode details for Double Struck F
Input
Output
Mapping
Code point(s)
HTML entity
F
𝔽
Distinct uppercase mapping
U+1D53D
𝔽
f
𝕗
Distinct lowercase mapping
U+1D557
𝕗
Unicode alphabet. This style substitutes supported Latin letters, and digits when the set includes them, with assigned Unicode mathematical or letterlike characters. Unsupported characters stay unchanged. It is a character substitution, not CSS formatting or an installed font.
Double Struck examples for words beginning with F
The source words below begin with ordinary F. Copy the transformed result you want; effects such as Upside Down can also reorder a whole word.
𝕗𝕒𝕝𝕔𝕠𝕟Source: falcon
𝕗𝕝𝕚𝕟𝕥Source: flint
𝕗𝕠𝕣𝕖𝕤𝕥Source: forest
𝕗𝕝𝕒𝕣𝕖Source: flare
𝕗𝕒𝕓𝕝𝕖Source: fable
𝕗𝕣𝕠𝕤𝕥Source: frost
𝕗𝕖𝕒𝕥𝕙𝕖𝕣Source: feather
𝕗𝕠𝕣𝕥𝕦𝕟𝕖Source: fortune
Want to type a full word? Open the Double Struck generator to transform your own text. To compare this same letter across the whole indexed set, see F in different fonts, or use the alphabet below to inspect another letter in Double Struck.
Why can the same Unicode letter look different on another device?
The code point stays the same, but the receiving operating system or app chooses the font that draws it. Shape, weight, spacing or fallback rendering can therefore vary even when the copied character itself has not changed.
What is the Double Struck letter F?
For uppercase F, Stylish Font Generator outputs 𝔽 (U+1D53D). For lowercase f, it outputs 𝕗 (U+1D557). Uppercase F maps to 𝔽 and lowercase f maps to 𝕗. The two cases remain distinct in this style.
Do uppercase F and lowercase f stay different in Double Struck?
Uppercase F maps to 𝔽 and lowercase f maps to 𝕗. The two cases remain distinct in this style.
How do I copy and use 𝔽?
Use the Copy button above, paste the result into the field you want, and verify it before saving. Unicode support, fonts, moderation filters and character limits can differ between apps and devices.