# How to enter useful E&R symbols (Ω, etc...)

What are useful alt-key shortcuts for symbols for Electronics.SE?

Note that your answer only works on Windows. Also, if it doesn't work for some reason, there's no way to view the source. It's much better (IMO) to use the HTML entities (ISO-8859-1). They're the same on every platform and browser, they're easy to remember and to use, and they don't introduce any ambiguity with character encodings into whatever storage system StackExchange uses.

Visit w3schools (or any resource for HTML), specifically the ISO-8859-1 reference, follow the link to the math, greek, and other reference.

The characters you pointed out are:

• μ - &mu;
• τ - &tau
• Ω - &Omega;
• ° - &deg;
• β - &beta;

Note that capitalization is important.

There are many others. An important note is that the less than and greater than symbols won't work in code at times - they're HTML reserved entities. If you have problems, use:

• < - &lt;
• > - &gt;

By the way, feel free to accept your own answer if you feel/it gets voted a better answer.

• HTML character codes don't seem to work in titles or comments, so short of copy-paste from some other source, I don't know how to enter them without using Alt-numpad. Nov 4 '10 at 14:24
• Hm. Bug report? Nov 5 '10 at 0:51
• Sounds like a great bug report to drop over on meta.stackoverflow.com Nov 8 '10 at 18:17
• My solution works in comments: μ τ Ω ° β 3 µV/√Hz±10° :) (Or rather ☺) Apr 27 '11 at 20:15
• So you mean that &Omega; don't work in comments. Jun 1 '11 at 7:00

I just search for "ohm symbol" or "micro symbol" and copy and paste from the google search results :D

In word processors, I use autocomplete to convert "kohm" to "kΩ", etc.

Even better: Now that I've switched to Windows 7, I use AutoHotkey as a universal AutoCorrect and shortcut solution, using Hotstrings like this:

:*:kohm::kΩ
:*:mohm::MΩ
:c*:uF::µF
:*:rthz::√Hz
:?:sup2::²
:?*:+-::±


So when I type Mohm it is automatically replaced by "MΩ". I can easily type "nV/√Hz", "Δ = 100°C", "47 µF±10%", "50 km²", "τ = 2π", etc without pressing Alt or memorizing code point numbers. This works in almost any text field, not just a particular app. See my script here.

(And, in general, please use Unicode when writing special characters. Don't use different fonts. It's extremely annoying to go to a manufacturer's website and see resistors written as "10 kW", for instance, because they used the Windows Symbol font and it's not displaying correctly.)

• Man, that would be one hefty resistor! Anyway, +1 'cause I too just copy-paste. I use a tiddly wiki as my "third hemisphere" and have several cheat sheets in it, including Greeks and other fancy characters. Nov 4 '10 at 4:11