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The Num lock should always be enabled. If it is disabled when you are attempting an alt code, it may cause errors or unexpected results in some applications. For example, Alt+4 could be interpreted as Alt +, ← which causes the browser to go back if the Num lock is disabled.
If your laptop keyboard doesn't have a separate NumPad, you should hold FN button with Alt button while typing the code.
This method does not work for Linux system, but it is possible to use Unicode.

Minus Symbol

Minus symbol ( − ) is a mathematical operator. Minus sign has many uses. First, it is used as a subtraction operator. The second usage is the value of a function for any real or complex argument is the additive inverse of this function. The minus sign is also used as a prefix of numeric constant. If placed before a number, it means that this number has a negative value. In grading systems, the minus sign means a lower level of grades. In programming, it is used as a determination operator.

Hyphen sign ( -) is usually used as an alternative of the minus sign; it can be used as bullet sign.

How to use and type Minus symbol code?

If your keyboard contains separate NumPad, you should be sure that it is enabled. If it is not, press the Num Lock key to activate it then press hold down the Alt key on the left side. Type the number that represents that character or the symbol you want to insert and then release the insert key.
For example, for the greek letter omega Ω press and hold Alt and the type 0234 and then release.
There is another method that works only for word documents. In this method, you should type the characters first then press Alt and X. For example ( 0234 + Alt + X for greek letter omega ).
If you have a keyboard that doesn't have NumPad here is what will work for you. Find the Function key ( FN ) then presses and hold the function key while holding press and release Num LK key; then release FN key. This method will activate the numeric keypad in your laptop.
Then do the same steps as in the previous example.
Notice that in IBM code you don't use 0 (Alt + 255 ) before the code which is different from the windows generator that requires to add 0 (Alt + 0255 ) before the code.

Table of Symbols and Codes

Symbol	Title / Description	Unicode	Code / HTML Code
⨪	Minus With Dot Below	⨪	⨪
−	Minus	−	−
－	Fullwidth Hyphen-minus	－	－
⨩	Minus With Comma Above	⨩	⨩
⩁	Union With Minus	⩁	⩁
➖	Heavy Minus	➖	➖
-	Hyphen-minus	-	-
⊟	Squared Minus	⊟	⊟
⨫	Minus With Falling Dots	⨫	⨫
⊖	Circled Minus	⊖	⊖
±	Plus-minus	±	±
̠	Combining Minus Below	̠	̠
⁻	Superscript Minus	⁻	⁻
⨬	Minus With Rising Dots	⨬	⨬
∖	Set Minus	∖	∖
˗	Modifier Letter Minus	˗	˗
∓	Minus-or-plus	∓	∓
≂	Minus Tilde	≂	≂
⁒	Commercial Minus	⁒	⁒
﹣	Small Hyphen-minus	﹣	﹣
⩬	Similar Minus Similar	⩬	⩬
∸	Dot Minus	∸	∸
₋	Subscript Minus	₋	₋