Why does Core Data Name the tables and attributes it creates in SQLite with a Z prefix?

Why does Core Data Name the tables and attributes it creates in SQLite
with a Z prefix?

References

Reference NO 1

http://stackoverflow.com/questions/15198685/why-does-core-data-name-the-tables-and-attributes-it-creates-in-sqlite-with-a-z

Reference NO 2

http://stackoverflow.com/questions/3629176/coredata-sqlite-malformed-db

Reference NO 3

http://blog.chrismiles.info/2011/07/core-data-debugging-with-sqlite.html

Reference NO 4

http://timeoutofmind.com/wordpress/2012/03/27/elementary_introduction_to_coredata_using_xcode_4_3_2_and_ios_5/

Reference NO 5

http://www.iphonelife.com/blog/31369/unleash-your-inner-app-developer-core-data

Reference NO 6

http://blog.daum.net/_blog/hdn/ArticleContentsView.do?blogid=0SHFk&articleno=153&looping=2&longOpen=

Reference NO 7

https://github.com/magicalpanda/MagicalRecord

Reference NO 8

http://blog.mongee.net/8