Although you can't add symbols to your Twitter username, you can add various symbols -- also known as glyphs -- next to your name. For example, you can add smiley faces, sad faces, stars and hearts. You can find and copy symbols using the Character Map utility on your computer or use glyphs from various websites. Note that not all symbols in the Character Map utility are supported. Some of them will not be displayed on Twitter.
Using the Character Map Utility
Type "Character Map" on the Start screen and then click "Character Map" in the list of results to launch the utility.
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Select the font that contains the symbols you want to use. You can just browse through the different fonts and pick the symbols you like. For example, the Arial font contains a smiley face, a sad face, a heart and a sun.
Click one of the symbols to view a larger version of it. If you like it, click the "Select" button to add it to the "Characters to copy" field. You can add as many symbols as you like to this field and then copy them with a single mouse click.
Click the "Copy" button to copy everything in the "Characters to copy" field to the clipboard.
Log in to Twitter, click the gear icon and then click "Edit profile" to start editing your Twitter profile.
Click inside the Name field and then press "Ctrl-V" to paste the symbols from the clipboard into the field. Alternatively, right-click inside the field and choose "Paste" from the context menu.
Click the "Save Changes" button if the symbols are displayed properly. If one of the glyphs is not displayed properly, delete it just like you would delete any other character. Your name is changed on Twitter immediately.
Launch your Web browser and navigate to a website that offers free emoji (links in Resources). Searching for "Twitter symbols" on Google will give you dozens of websites that provide free emoji.
Select the emoji you want to add to your Twitter name and copy them to the clipboard. Some websites allow you to select multiple emoji and then click a "Copy" button to copy them to the clipboard. On other websites, you must select the emoji with the mouse and then press "Ctrl-C" to copy them to the clipboard.
Click the gear icon on Twitter and then click "Edit profile" to start editing your Twitter profile. Click inside the "Name" field.
Press "Ctrl-V" to paste the emoji from the clipboard into the Name field. Alternatively, right-click inside the field and select "Paste" from the context menu. Click "Save changes" to change the name.