Roger pointed out:

>  Section II A says:
>  Arrays of ranks 0 [...] are also called _atom_

>  The dictionary page for <
>  says that  <y  is an _atomic encoding_ of y , 

Yes; I'd noticed this, but I disputed the Dictionary's usage.

>  One can read too much into the meaning of the word
>  "atom" (indivisible).  [...]  An entity such as _2.3j5 or 
>  even 2.3 _is_ divisible

This is a sturdy argument; I concede.  

Regarding the words suggested in this thread:

   *  Monatomic:  I would avoid monatomic as it could imply any
      array with  1=*/@$  .  For example,  1 1 $ 0  is monatomic 
      but not an atom.  

   *  Molecule:  too cute.  Also, I think that the word chosen 
      should have a mathematical (rather than chemical) flavor. 
  
   *  Compound/Composite: Could denote boxed arrays 
      (because they "mix types"). 

   *  Collective: Treacherous; a collection is a set, and
      a set may have one member.  

   *  Cluster:  ok, but doesn't connote organization like 
     "lattice" does.

   *  Tomic/Tommy:  favored,  because those are mnemonic 
      and carry no baggage.  But avoid the construction
      "a tomic array ... ".

-Dan
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