The “19 inch rack”, you need to know about server racks. Server racks are open metal frames or enclosures that can store multiple electronic devices
I see all your sexy racks, and raise you my complete disaster : r/homelab
Blanking Panels for 19 Inch Server Racks 1RU - 6RU
Raising Electronics Server Rack 4 Post Open Rack Frame Rack Enclosure 19 Inch Adjustable Depth Cold Rolled Steel（15U,36 Inch Height） : Electronics
How to convert an old Laptop to a Rack-Mountable Computer, by Paolo Campitelli
StarTech.com 22U 36in Knock Down Server Rack Cabinet with Caster - Rack - 22U - for P/N: UNISLDSHF19
Rack Mount Kit for Ubiquity Unifi Switch 8-150W RM-UB-T2
What Is a Server Rack: Specifications, Usage, History, and More
What is a Server Rack Cabinet?
RAISING ELECTRONICS Open Rack 15U 4 Post Open Frame 19-Inch Data Network Desktop Server/Audio Rack : Electronics
Server Rack Cabinet - 42U 36in Deep - Server-Racks, Server Management
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Guide to the Best Server Rack Cable Management System - Nerd Techy