Have no idea what plates means.. I got 6. Got Istanbul because everybody knows Istanbul. Got Ankara because I'm good with country capitals and I learned that in 5th grade when I did a report on Turkey. Got Trabzon because it's an important city historically and I'm a history buff. Got Gaziantep because it's also on my oldest cities quiz. Got Izmir because.. I don't know why actually. Got Batman because once you know there is a city named Batman it's impossible to forget, no matter how insignificant it is. And then I gave up.. but.. after the answers were revealed I saw 3 or 4 others that I'd heard of before.
I got all except Karabük. Plates mean, motor vehicle licence plates. Every province (the ones above are provinces of Turkey) has its own licence plate code number, which is determined by two digits. Those two digits are the first two digits written on licence plates, so one can understand where a vehicle is registered. For example, if a plate is like this: 34 xx xxxx, then that vehicle is registered in Istanbul.