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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.

Diagonal Symbol

Diagonal is a line that connects one corner with the corner furthest away. An example of diagonal is a line going from the bottom left corner of a square to the top right corner.

The word "diagonal" originates from the ancient Greek 'diagnosis,' meaning "from angle to angle." In matrix algebra, a diagonal makes a set of entries that are increasing from one corner to the farthest corner. There are also other, non-mathematical uses of diagonal.

A diagonal line creates triangular shapes as it interacts with the frame. Diagonals are most attractive when they interact with horizontal lines and an opposite diagonal, which produces complex sets of triangles. Long diagonals may create big triangles that function as arrows.

How to use and type Diagonal 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
⤬	Falling Diagonal Crossing Rising Diagonal	⤬	⤬
⤰	Rising Diagonal Crossing South East Arrow	⤰	⤰
⟍	Mathematical Falling Diagonal	⟍	⟍
⟋	Mathematical Rising Diagonal	⟋	⟋
⤯	Falling Diagonal Crossing North East Arrow	⤯	⤯
⤫	Rising Diagonal Crossing Falling Diagonal	⤫	⤫