help with naming convention

["Patrick Mc(avery" <patrick@...>]

I am planning on changing my business name for the 6th time. In a 
project I did a while back, I used X as a separator and wrote code like 
this, someXstupidXvar, I'm really bad at naming things!

In my next project I will be heavily using the Lua C API. I like their 
naming conventions but I want my code to be easy to spot amongst theirs.

I figure that most non-trivial names have a commonly used part and one 
or more uncommon parts.

I was thinking of truncating the common part at 3 or 4 characters and 
capitalizing it, even if it did not sample the syllables of the full 
name. So STA instead of STK for stack or ARR instead of ARY for array.  
I was then thinking of separating with an underscore and then using 
lowercase and a non-abbreviated name(s) for the less common parts.

so here are some fictitious examples

ARR_pop
ARR_rotate_left
STR_concatenate
STR_copy
NUM_to_hex
NUM_double

Does this sound logical? Any pitfalls I am setting myself up for? Is 
this more of my naming insanity?

Thanks for reading-Patrick