It's a trap bar! (Sometimes called a "hex bar" due to the hexagonal shape.)
While originally intended for shrugs (working the trapezius muscles, hence "trap" bar), it's most commonly used these days for trap bar deadlifts since it makes it easier to maintain a neutral spine and eliminates shin wear and tear.
This was my first time using one. A little weird, but a nice addition to the toolbox. Thanks for the gift, me!