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said: Hi FDO, Mrs Fahrenheit wading in here.
Don't put strings of numbers on the end of your book titles. Please.
There have been lots of lovely arguments from librarians and die hard geek types who have invented several perfect systems for you and ARealGirl to choose from to keep your own heads straight. Hell, you should probably employ some of them as clerks after the plaid tanks roll.
Choose a system, use it, preferably on your hard drive, but keep it the hell off the spines of the merchandise.
Like many commentators I am a bibliophile. I love books, always have, always will. MrF and I have so many books we have had to rent a storage locker to keep some of them in. I know how to use libraries, real ones, with dusty shelves and card index files. I know the dark arts of successful computer file nomenclature.
The suggestions for multi digit, "file extensions," on the end of book titles is likely to be an epic fail. It will not help anyone to see, "at a glance," where in the Siglerverse a story belongs. They will require a decoder ring the size of Jupiter to work it out.
A newbie will look at the title, think, "Wtf?" Then they will go buy something else that doesn't require a maths degree to work out the title. Maths, for which you can susbstitute numbers, scare people. You want people to buy your output. Scared people don't buy. To expand your readership, you want to draw people in, not freak them out.
Since your 'verse now intersects mine, via MrF, I'm throwing my opinion into the mix because he is a Junkie, and if I have to live with him moaning about the numbers on the titles for the rest of my life, you are going to need more than a plaid tank to protect you.