This symbol means that a ticket has been offered for sale by another fan via the official Ticketmaster Resale and is available for you to buy.
The buying process is exactly the same as buying a new ticket on ticketmaster.de. In contrast to other secondary market platforms, you can be sure that the ticket offered is genuine and that you will get exactly the seats you have selected.
When an event is activated for the Ticketmaster Resale, the ticket availability can change - so if the specific type of tickets or the desired number of tickets is not available, just check back later.