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Comment by davej | Hacker News Reader

Spot on, I do the same (but I use $this as the variable name).

I use the $ sigil to differentiate between variables that are DOM elements and variables that are jQuery-wrapped DOM elements.

Same here.

     var _this = this;    //vanilla
     var $this = $(this); //jQuery

Though, I have encountered people who are really against the $var for stylistic reasons - so ymmv.