Recycling by product massive number of types of plastic, they each carry a resin identification code, and must be sorted before they can be recycled. This can be costly; while metals can be sorted using electromagnets, no such 'easy sorting' capability exists for plastics. In addition to this, while labels do not need to be removed from bottles for recycling, lids are often made from a different kind of non-recyclable plastic. To help in identifying the materials in various plastic items, resin identification code numbers 1-6 have been assigned to six common kinds of recyclable plastic resins, with the number 7 indicating any
National identification number Turkish citizen is assigned a unique personal identification number called Turkish Identification Number ( or abbreviated as "T.C. Kimlik No."), an 11-digit number with two trailing check digits. This assignment is organized through the MERNIS (abbreviation for ) project that started on 28 October 2000. The national ID card is compulsory for every citizen and is issued at birth. Parents need to register to the authorities with the child's birth certificate. The identification number is used by public institutions in their certificates and documents like identity card, passport, international family book, driving license, form and manifesto they issue to citizens.