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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.

Other Math Symbols

Intersection Symbol

What does Intersection Symbol mean?

The intersection symbol ∩ has the shape of a horseshoe opening downwards. The intersection symbol is commonly used in math and engineering mainly to indicate that if one has two sets of elements, then the intersection symbol becomes the group that incorporates the relevant elements, creating a new set of elements.

The intersection symbol is widely recognized to be an associative operation because of the reason that any set of a, b, or c, end up with this: a ∩ (b ∩ c) = (a ∩ c) ∩ c. Besides, the intersection symbol is commutative, for instance in a and b, a ∩ b is equal to b ∩ a. If one has a group of sets a, b, c, and d, then it may be written like this: a ∩ b ∩ c ∩ d.

Moreover, if we take two sets, e.g., A and B, then the intersection of A and B, written A B, becomes the set C of all elements which are in either A and B. For example, the diagram which is illustrated below shows the set intersection. Sets A and B are designated as circles (including interiors). The set of A B is shown by the hatched region.

In math, the intersection of two sets A and B is notated by A ∩ B, which is the set that contains all the elements of A that also is common (or even equal) to B. The intersection symbol is written by using the sign "∩" between the elements; It is also known as infix notation.

How to use and type Intersection symbol code?

If your keyboard has a separate Num Pad, then you can be sure that your keyboard will enable you to easily type the intersection symbol. If it is not, then follow these steps:

Step 1 - You should press the Num Lock key in order to activate the Num Pad.

Step 2 - After that, you should tap and hold down the Alt key located right on the left side of the keyboard.

Step 3 - Then, you will need to type the digit (i.e., number key) that represents that symbol or character you wish to insert (in that case, it is the intersection symbol).

Step 4 - Next, release the insert key. For instance, for the greek letter omega depicted as Ω, you will need to press and hold the Alt key and type 0234 on Num Pad and then release it.

However, there is another way that works only for MS Word documents. For that, you will have to type the characters first then click on the Alt and X keys. For instance, type 0234 + Alt + X if you want to insert the Greek letter omega).

Furthermore, if you have a keyboard that does not contain a Num Pad, then here is what may work for you. Follow instructions:

Step 1 - Search for the Function key (i.e., FN) and press and hold that key. While you hold the FN key you can release the Num key. By following this step, you will be enabled to activate the numeric keypad on your laptop.

Step 2 - Then do the same steps as given in the previous example above. Note that in IBM code you do not have to use 0 (Alt + 255) before the Alt code which is different from the windows PC generator that requests to add 0 (Alt + 0255) before the Alt code.

Types of Intersection Symbols and their Unicode and HTML Codes

Here are some of the versions of intersection symbols with their definitions, Unicodes, and HTML codes:

⩈ Union Above Bar Above Intersection – Unicode ⩈ HTML code ⩈

⩃ Intersection With Overbar – Unicode ⩃ HTML code ⩃

⨅ N-ary Square Intersection Operator – Unicode ⨅ HTML code ⨅

⩄ Intersection With Logical End – Unicode ⩄ HTML code ⩄

⩇ Intersection Above Union – Unicode ⩇ HTML code ⩇

⫛ Transversal Intersection – Unicode ⫛ HTML code ⫛

⩍ Closed Intersection With Serifs – Unicode ⩍ HTML code ⩍

⩀ Intersection With Dot – Unicode ⩀ HTML code ⩀

⩉ Intersection Above Bar Above – Union Unicode ⩉ HTML code ⩉

⩎ Double Square Intersection – Unicode ⩎ HTML code ⩎

⩆ Union Above Intersection – Unicode ⩆ HTML code ⩆

⩋ Intersection Beside And Joined With Intersection – Unicode ⩋ HTML code ⩋

How to use and type Intersection 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
Union Above Bar Above Intersection ⩈ ⩈
Intersection With Overbar ⩃ ⩃
N-ary Square Intersection Operator ⨅ ⨅
Intersection With Logical And ⩄ ⩄
Intersection Above Union ⩇ ⩇
Intersection Beside And Joined With Intersection ⩋ ⩋
Transversal Intersection ⫛ ⫛
Closed Intersection With Serifs ⩍ ⩍
Intersection With Dot ⩀ ⩀
Intersection Above Bar Above Union ⩉ ⩉
Double Square Intersection ⩎ ⩎
Union Above Intersection ⩆ ⩆