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2013/4/13 Ross Bencina <rossb-lists@audiomulch.com>:

> For what it's worth I thought 'end' should be a square box not a round
> bullet. Maybe box has a different meaning in APL?

In most APL dialects a big box means stdin/stdout treated as a variable,
e.g.

    data←⎕
    ⍝ do some computations
    ⎕←answer

There's no small box, I used a diamond instead as being a box rotated 45°.
But I like the bullet, it has the mnemonic value of a FULL stop.