I have to write x/100000 with square character: x*10-5 ,but the '-5' should be above 10 so it is known that it is x/10/10/10/10/10.
How do I do that?
If you are trying to get x*10-5, as you would write it by hand, then your only option is your word processor's superscript option for text (unless you have a full equation editor feature handy).
The only superscript characters I know of in Unicode are 1, 2, 3 (listed as sup1, sup2 and sup3 respectively in this reference) and those characters that are naturally above the centre-line (such as the degree symbol).
The common way of representing such a math clause in plain text is x*10^-5
(this is how it would be represented in most programming languages).
You can copy-paste superscript numbers (and minus sign) from here: ⁻ ⁰ ¹ ² ³ ⁴ ⁵ ⁶ ⁷ ⁸ ⁹
These can also be helpful: ½ ⅓ ⅔ ⅕ ⅖ ⅗ ¼ ¾ ⅘ ⅙ ⅚ ⅛ ⅜ ⅝ ⅞
The most common superscripts of 1, 2 and 3 were included in ISO-8859-1, but a full superscript number set is available in Unicode.
U+207B is ⁻
, and U+2075 is ⁵
. In HTML, you can represent these with:
⁻⁵
Details are available from http://www.unicode.org/charts/PDF/U2070.pdf, which is authoritative.
More information is also at Wikipedia.
Assuming you mean in a word processor of some sort, you probably want to format the '-5' as superscript.
Also, if it's '-5', then is isn't a square character. It's only squaring when it's raised to the power of two.
If you are on a Mac, type Ctrl+Cmd+Space and you will get an Emoji popup. Then, type the number you want (2) and the square will be part of the results 😎