The 16-18 letter name is contained within this symmetrical, recursive anagram containing, infinitely-interweaving mnemonic device [or 'symbol', 'sigil', 'seal', etc.. if you'd prefer ;]

Since the name 'Tlaloc Quetzalcoatl' begins & ends with the letters 'T' & 'L', it's neater as far as lending itself to have a [sort of] recursive anagram feel about it that has no beginning or ending, much like the traditional Celtic art that I grew up wanting to be able to learn to draw for myself one day.

Little did I know that I had to first learn what the difference between a symmetrical and an asymmetrical design was before I could ever grasp the thought of how to begin doing one of these types of designs for my illustrations/watermarks, but mostly needed to learn so I could divine a symbol that I designed myself and one which only I know the true provenance of (or one that only I 'knew' of, at least)].

Finally 'found' this [or 'it' found me] in 2001, back when I made a focused effort on finding the right stream of thought that would enable me to put down a symbol that interweaves, has no beginning or ending - this symbol was the end result of that effort of mine.

It was not until around five (5) years later that I would discover that this symbol also contains my name, hence the significance of the aforementioned 16-18 letters within the name [TL]aloc quetzalcoa[TL].