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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.

Recycle Symbol

The recycling symbols were generated as a part of a campaign to raise awareness about the environment. It was initiated by an American corporate who has been working in recycled paperboard which sponsored a contest in high schools and colleges to draw the best design for the awareness campaign.

The sign with three arrows going in a triangle indicates that it's recyclable. Sometimes, the sign will come with a percentage sign in the middle, signifying how much of it has been made from recycled materials.

A triangle with three arrows indicates that the item is eligible to be recycled. The numbers and letters act as identification for the recycling teams. Plastics are categorized into one of seven categories, each one a different material that is more or less easy to recycle.

How to use and type Recycle 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
♻	Black Universal Recycling Symbol	#x267B;
♼	Recycled Paper Symbol	#x267C;
♲	Universal Recycling Symbol	#x2672;
♶	Recycling Symbol For Type-4 Plastics	#x2676;
♵	Recycling Symbol For Type-3 Plastics	#x2675;
♳	Recycling Symbol For Type-1 Plastics	#x2673;
♹	Recycling Symbol For Type-7 Plastics	#x2679;
♸	Recycling Symbol For Type-6 Plastics	#x2678;
♽	Partially-recycled Paper Symbol	#x267D;
♴	Recycling Symbol For Type-2 Plastics	#x2674;
♷	Recycling Symbol For Type-5 Plastics	#x2677;
♺	Recycling Symbol For Generic Materials	#x267A;