The display size is 7 inches (both first and second generation).
The Nexus 7 is an Android Tablet made by Google. It has a screen size of 7 inches.
The 7 in Google Nexus 7 has not been openly mentioned to stand for anything. However, the recent Nexus tablet iterations (and to some degree, the phone as well) appear to refer to screen size. Both generations of the Nexus 7 have 7 inch and 7.02 inch screens respectively. The Nexus 10 has a 10.1 inch screen. The Nexus 4 has a 4.7 inch screen. The rumored Nexus 5 is supposed to have a 5 inch (or larger) screen.
There are various types of Nexus devices, but the Nexus 7 is part of that same family.
The 2012 Nexus 7 came out on July 2012. The 2013 Nexus 7 came out on July 2013.
If we are talking on display size alone, the Nexus 7 is considerably bigger...7.02 inches with the Nexus 7 2013 version vs. 4 inches on the iPod Touch. Most of the Nexus 7's specs (both the 2012 and 2013 editions) are much better thn the iPod Touch, having faster processors, more RAM memory, aformentioned larger display. The exception is storage. The Nexus 7's maximum storage size is 32 gb, while the iPod Touch has 32 and 64 gb available.
The 2012 Nexus 7 debuted on July 2012. The 2013 Nexus 7 debuted on July 2013 (August 2013 in Canada).
Yes, the Nexus 7 (2013) is Bluetooth Smart Ready certified. The 2012 Nexus 7 supports traditional Bluetooth.
In the 2012 Nexus 7, it came with a single camera (in the front). The 2013 Nexus 7 has two cameras, one in the front and one in the back.
Nexus 7 tablet 2013 Has a front and rear Camera.
Yes, the Nexus 7 comes in LTE versions.
The Nexus 7 is the better tablet.
The 2012 Nexus 7 had a soft leather back. The 2013 Nexus 7 went for a harder shell with a soft touch-coated plate.