The emoji with a straight line mouth and open eyes shows not giving away any particular emotion. It does not represent disinterest as much as it means that someone is unimpressed, indifferent, or awkward. Depending on the situation Straight Face Emoji (Neutral Face) can mean "Whatever..." or "I don't really know what else to say!"
Here you can see how Straight Face Emoji / Neutral Face Emoji looks like on a different platforms.
Emoji are smileys and ideograms widely used in messaging and on websites. This characters have almost replaced ASCII emoticons or kaomoji. Over one thousand emoji are standardized in various genres, including facial expressions and emotions, plants, animals, common objects, places, transport and much more.
Nowadays emoji exist on all popular platforms: Windows, Linux, Mac OS, Android and Windows phone. All popular websites and applications allow using emoji among with emoticons.
Use emoji on Facebook and Twitter, for blogging, chatting and messaging, in documents, presentations and much more!
How to type Straight Face Emoji / Neutral Face Emoji
There are number of methods to type Straight Face Emoji / Neutral Face Emoji. Easiest way is to copy & paste, but other methods, like windows alt-codes and HTML-entities (for web sites) are also popular enough.
Straight Face Emoji / Neutral Face Emoji HTML-entities
HTML entites are intended for using on websites. You can put Straight Face Emoji / Neutral Face Emoji html entity code in decimal or hexadecimal form right in your message, and it will be translated into graphical representation of Straight Face Emoji / Neutral Face Emoji after you submit.
Copy and paste Straight Face Emoji / Neutral Face Emoji
It's very easy to get Straight Face Emoji / Neutral Face Emoji both on computer and mobile without any emoji keyboard installed. All you need is to select, copy and paste this symbol: . Select this like a regular text, and copy to the clipboard. After doing that, switch to another website or application and paste emoji using context menu or keyboard. Hint: use Ctrl/Cmd+C keys to copy, and Ctrl/Cmd+V to paste emoji.
Even if emoji symbol or smiley looks like a black square or question mark, it most probably will be converted into appropriate image by web site or application where you paste it.
Straight Face Emoji / Neutral Face Emoji Alt-codes for Windows
It's easy to type emoji or any other Unicode character with code value up to U+0ffff by it's alt-code in MS Windows. Here are instructions.
Press and hold Alt key on keyboard.
Hit the Plus (+) button on numeric keypad.
Type the hexadecimal Unicode value digit-by-digit
Now release the Alt key and you'll see your character.
Note 1. This method works only for unicode codepoints U+0ffff and bellow.
Note 2. If this trick does not work, you should check some settings in your Windows Registry. If you don't know what the Registry is, please don't try this! Run regedit.exe and navigate to the HKEY_Current_User/Control Panel/Input Method branch. Add EnableHexNumpad key with type of REG_SZ and set it to "1". You may need to log off and back on to enable this input type.