Peridromofiliya (attachment) is collecting of signs of payment in public transport (tickets, counters, coupons, membership cards etc.) In common speech it is called biletofiliya (áèëåòîôèëèÿ) . It is also an auxiliary historical discipline, studying the history of organization and functioning of public transport (a tram, a trolleybus, a bus, a taxi, underground and others) as well as distant one (planes, cars, trains and water transport).