Copy the exact output for J/j, check its Unicode code point, and see whether this style preserves case or maps both forms to one symbol.
𝕁Input: uppercase J
𝕛Input: lowercase j
Case behavior: Uppercase J maps to 𝕁 and lowercase j maps to 𝕛. The two cases remain distinct in this style.
Unicode details for Double Struck J
Input
Output
Mapping
Code point(s)
HTML entity
J
𝕁
Distinct uppercase mapping
U+1D541
𝕁
j
𝕛
Distinct lowercase mapping
U+1D55B
𝕛
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 J
The source words below begin with ordinary J. Copy the transformed result you want; effects such as Upside Down can also reorder a whole word.
𝕛𝕒𝕕𝕖Source: jade
𝕛𝕒𝕘𝕦𝕒𝕣Source: jaguar
𝕛𝕖𝕥Source: jet
𝕛𝕖𝕨𝕖𝕝Source: jewel
𝕛𝕠𝕦𝕣𝕟𝕖𝕪Source: journey
𝕛𝕦𝕟𝕚𝕡𝕖𝕣Source: juniper
𝕛𝕠𝕝𝕥Source: jolt
𝕛𝕦𝕓𝕚𝕝𝕖𝕖Source: jubilee
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 J in different fonts, or use the alphabet below to inspect another letter in Double Struck.
For uppercase J, Stylish Font Generator outputs 𝕁 (U+1D541). For lowercase j, it outputs 𝕛 (U+1D55B). Uppercase J maps to 𝕁 and lowercase j maps to 𝕛. The two cases remain distinct in this style.
Do uppercase J and lowercase j stay different in Double Struck?
Uppercase J maps to 𝕁 and lowercase j maps to 𝕛. The two cases remain distinct in this style.
How do I copy and use 𝕁?
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.
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.