I want a Unicode character that can be used to represent a new line. I've seen it before but can't find it with any of the Google searches I've tried. It looks like this:
------
|
<----
There are several possibilities. The choice may depend on font, too, since not all of them are available in all fonts, and some of them have rather varying shapes, and some work better in small sizes than others:
⤶ U+2936 ARROW POINTING DOWNWARDS THEN CURVING LEFTWARDS
↵ U+21B5 DOWNWARDS ARROW WITH CORNER LEFTWARDS
⏎ U+23CE RETURN SYMBOL
↲ U+21B2 DOWNWARDS ARROW WITH TIP LEFTWARDS
↩ U+21A9 LEFTWARDS ARROW WITH HOOK
To represent an abstract idea of new line, rather than a symbol reflecting a keyboard key for new line, you could consider these, too:
␍ U+240D SYMBOL FOR CARRIAGE RETURN
 U+2424 SYMBOL FOR NEWLINE