$ Variable (Dollar Sign) in Chrome?

This has changed yet again, even since just last year.

The devtools console provides $ as an alias to document.querySelector, along with many other things; here’s an excerpted list:

• $(selector) returns the reference to the first DOM element with the specified CSS selector. This function is an alias for the document.querySelector() function.
• $$(selector) returns an array of elements that match the given CSS selector. This command is equivalent to calling document.querySelectorAll().
• $_ returns the value of the most recently evaluated expression.
• The $0, $1, $2, $3 and $4 commands work as a historical reference to the last five DOM elements inspected within the Elements panel or the last five JavaScript heap objects selected in the Profiles panel.

…and a bunch of others.

Note how it calls $ an alias of document.querySelector, but says $$ is “equivalent” to calling document.querySelectorAll. Neither seems to be literally true; $ === document.querySelector is false, and $$ returns an array, not a NodeList.