Something doesn't work?

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.

Cross Symbol

The cross is a religious symbol for the Christian religion. The symbol takes the shape of two perpendicular lines; sometimes, they are not equal in length. The word cross comes from the Latin origin "crux," which is a device used for torture. The symbolism of the cross in the Christian religion started when Jesus was tortured on a two perpendicular wooden bar. The symbol is sometimes different from a group to another like the Black Latin cross, Orthodox cross and simple cross potent of Jerusalem.

In math, the cross symbol is used for summation of two numbers, mathematical equations, and iteration in programming languages. It is known as the plus sign.

How to use and type Cross 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	Code / HTML Code
✠	Maltese Cross	#10016;
⁜	Dotted Cross	#8284;
☦	Orthodox Cross	#9766;
☩	Jerusalem Cross	#9769;
☨	Cross	#9768;
♰	West Syriac Cross	#9840;
✚	Heavy Cross	#10010;
♱	East Syriac Cross	#9841;