How to make the hash symbol: PC, Mac, iPhone, and Android

Published on May 11, 2026
Updated on May 12, 2026
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The hash symbol (#) used on various devices.

The hash symbol (#), also known as the pound sign or sharp , is now ubiquitous in the digital world. From hashtags on social media to programming codes, this small symbol plays a fundamental role. But how do you type the hash symbol on the different platforms we use daily? In this article, we will explore the different methods for inserting the hash symbol on Windows PCs, Mac PCs, and iPhone and Android smartphones.

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Insert the hash symbol on a Windows PC

When typing on a Windows PC, there are several ways to insert the hash symbol :

  • Alt key + numeric keypad key: Hold down the Alt key on the keyboard and type 35 on the numeric keypad. Release the Alt key and the hash symbol (#) will appear.
  • US international keyboard: If you have a keyboard set to English (United States), you can type the hash by pressing the key to the right of the Enter key and above the backslash key (\). This key usually has both the hash symbol (#) and the tilde symbol (~).
  • Character Map: Search for “Character Map” in the Windows Start menu. A window with a list of symbols will open. Find the hash symbol (#) and double-click on it. You can also copy it to the clipboard and paste it where you need it.
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The hash symbol on a Mac PC

How to make the hash symbol: PC, Mac, iPhone and Android - Summary infographic
Summary infographic of the article “How to make the hash symbol: PC, Mac, iPhone and Android”
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On a Mac PC, inserting the hash symbol is just as simple:

  • Alt + 3: Press the Alt and 3 keys simultaneously to make the hash symbol (#) appear.
  • US International keyboard: Similar to Windows, if you use a US International keyboard, the key to the right of the Enter key and above the backslash key () will allow you to type the hash (#).
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How to type the hash symbol on an iPhone

On iPhone smartphones, the hash symbol is located directly on the numeric keypad:

  • Numeric keypad: Tap the 123 key to display the numeric keypad. The hash symbol (#) will be present on one of the keys.
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The hash symbol on an Android smartphone

On Android, typing the hash symbol is also quick and easy:

  • Numeric keypad: As with the iPhone, tap the key that activates the numeric keypad. The hash symbol (#) will be visible among the various symbols available. The precise position of the hash symbol may vary slightly depending on the keyboard used and the smartphone model.
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Using the hash symbol (#)

The hash symbol has several functions in the digital world:

  • Hashtag: On social media like Twitter, Instagram, and Facebook, the hash symbol (#) precedes a word or phrase to create a hashtag , making the content searchable and categorizable.
  • Programming: In various programming languages , the hash symbol (#) is used to comment out code, to define preprocessor directives, or to indicate hexadecimal numbers.
  • Music: In music, the hash (#) indicates a sharp, an alteration that raises the note to which it refers by a semitone.
  • Numbering: In some contexts, the hash symbol (#) can be used as an abbreviation for “number”, for example #1 instead of “number 1”.
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Hash symbol and international keyboards

It is important to note that the position of the hash key may vary depending on the language set on the keyboard. On keyboards with an Italian layout , for example, you may need to use a different key combination than those described above.

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Summary table: How to make the hash symbol

Platform Method Keys/Actions
Windows PC Alt + numeric keypad Alt + 35
Windows PC US International Keyboard Key to the right of Enter, above Backslash
Windows PC Character Map Search for “Character Map” in the Start menu.
Mac PC Alt + 3 Alt + 3
Mac PC US International Keyboard Key to the right of Enter, above Backslash
iPhone Numeric keypad Tap “123” and then the # key.
Android Numeric keypad Press the numeric keypad button and then the # button.
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The hash symbol in different languages

The hash symbol (#) can have different names depending on the language. In English, it is commonly called “hash”, “hashtag” (in the context of social media) or “pound sign”. In Italian, in addition to “cancelletto” , it can also be called “diesis” (in the musical field) or “sharp” (from English). Knowing the different names can be useful when searching for information online or communicating with people of other nationalities.

Common Problems and Solutions

Sometimes, you may encounter difficulties when entering the hash symbol . Here are some common problems and possible solutions:

  • Keyboard not working properly: Make sure the keyboard is properly connected and that the keys are not stuck. Try restarting your computer or smartphone.
  • Incorrect keyboard layout: Check that the selected keyboard layout is the correct one for your language. A different keyboard layout may assign different functions to the keys.
  • Unsupported special characters : In some programs or applications, the hash symbol may not be supported. Try copying and pasting the symbol from another source.

In Brief (TL;DR)

The hash symbol is fundamental in the digital world, from social media hashtags to programming.

It is easy to type on different platforms such as Windows, Mac, iPhone, and Android, using key combinations or the numeric keypad.

Knowing the right methods allows you to use the hash tag effectively in every situation.

Conclusions

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In this article, we have thoroughly explored the different methods for inserting the hash symbol (#) on a variety of platforms, from Windows and Mac PCs to iPhone and Android smartphones. We have seen how key combinations and the use of the numeric keypad make this process quick and easy. We have also delved into the multiple uses of the hash symbol in the digital world, highlighting its key role in hashtags, programming, music, and numbering. Finally, we have addressed some common problems that might prevent the insertion of the hash symbol and offered practical solutions to overcome them. We hope this article has been useful for you to master the use of the hash symbol and fully exploit its potential in every situation.

Frequently Asked Questions

disegno di un ragazzo seduto con nuvolette di testo con dentro la parola FAQ
What is the hash symbol?

The hash symbol (#) is a typographic character used in various contexts, such as hashtags on social media, programming codes, and musical notation.

What is the name of the hash symbol in English?

In English, the hash symbol is called “hash”, “hashtag” (in the context of social media) or “pound sign”.

Can I use the hash symbol in all programs and applications?

In general, yes, but some programs or applications may not support the hash symbol or may require it to be entered using specific methods.

This article is for informational purposes only and does not constitute financial, legal, medical, or other professional advice.
Francesco Zinghinì

Engineer and digital entrepreneur, founder of the TuttoSemplice project. His vision is to break down barriers between users and complex information, making topics like finance, technology, and economic news finally understandable and useful for everyday life.

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