Just watched a video about Array programming which mentions APL and J. It also mentioned a couple of interesting facts about Ken Iverson I'd not heard elsewhere:

1 - Iverson originally wanted to call his new language Iverson's Better Math but his company blocked this so he went for A Programming Language (APL) instead. NB. Iverson worked for IBM at the time :)

2 - Iverson passed away at a computer screen.

Video was very interesting so posted link on HN: http://news.ycombinator.com/item?id=4931929

Nice one.

But it is not widely enough known that just naming it would have clarified Dijkstra's comment about APL.