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'datum' often is a more appropriate name. 'data' is ambiguous w.r.t singular/plural.

However, I prefer 'item' and 'items', as that completely evades any possible confusion. Especially useful when iterating over generic containers. Compare:

  Foreac

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Oops, hit the "reply" button by accident when trying to dismiss a spelling correction on the iPad, and I do not know how to edit, due to my anti-procrastination setting. Intended was to compare:

  Foreach item in items

With

  Foreach datum in data

I also use itemss for a container of containers:

  Foreach items in itemss
    Foreach item in items

Of course, if the code is less generic, different names are more appropriate:

  Foreach row in matrix
    Foreach cell in row

For small scoped loops, I usually just abbreviate to the first letter. I'm not sure how others feel about this, but I think it's perfectly legible:

  for i in items:
    i += 1

  for r in rows:
    for c in columns:
      matrix[r][c] *= 2

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