1. This comes from Mathematica (IIRC) and is not otherwise standardized, but there may be some disambiguation benefit in using the double-struck italic letters from Unicode’s Letterlike Symbols block: U+2148 ⅈ and U+2149 ⅉ.

At the very least, I’ve found it useful to use those characters in my source code (via \newunicodechar) in case house standards require upright roman, or bold, or whatever formatting.

• Thanks for mentioning! Tom.

2. falowo

Hi
I want to put a curl over voltage symbol to signify that it is complex voltage . Do you know how to do it

• tom

Hello,

I’m not familiar with the notation, which is why I might have gotten the symbols wrong. You might still find the code below useful.

Cheers, Tom.

\documentclass[11pt]{article}
\usepackage{amsmath}
\usepackage{siunitx}
\begin{document}

Some text $\overset{\sim}{\text{\si\volt}}$ other text.

Some text $\displaystyle_{\text{\si\volt}}^{\sim}$ other text.

\end{document}
• tom

Hi Frovis,

Here’s how to get ‘x-bar’ as shown in the picture:

$\bar{x}$
%or
$\overline{x}$

Best, Tom

3. I hoped that \mathbb{i} would print the double-struck italic letters from Unicode’s Letterlike Symbols block: U+2148 ⅈ, but it prints a strange thing that is not even near my expectation… Could someone please fix this?

• tom

The stix package has a double-struck italics i, although I’m not sure this is the font you were looking for.

\documentclass{article}
\usepackage{stix}
\begin{document}
$\mathbbit{i}$
\end{document}