Why word can’t be displayed in wordpress?

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These tags will be stripped by WordPress, as if you are inserting a code directly to your post’s content.

To add special characters to your post, switch to visual editor, and then click the special character button as shown below:

enter image description here

Now you can select any character you want from the list.

You can also do this by using text editor. Enter &lt; for < and &gt; for > in text editor, so your phrase will be like:

&lt;newline&gt;

These are the HTML entity equivalents for your provided unicode characters.

PS: Image’s credits goes to WPBegginer.com