[quicktips/index] Unicode escapes

[xfq]

[source] (https://www.w3.org/International/quicktips/index) [en]

Escapes such as Numeric Character References (NCRs), and entities are ways of representing any Unicode character in markup using only ASCII characters.

I don't think it's necessary to mention markup here, because there are also escapes in other places such as CSS and JavaScript.

And later it also mentions "Using character escapes in markup and CSS".