Helen, thanks for the link, but the mystery buttons don't appear on that page. It's a two-storey house with a front door in the center, a barge board, and a chimney. Couldn't be anything but a house.

Brucie: there is no name on the calculator, so can't contact the maker.

Funny, I thought there would be lots of people with these buttons on their calculators. (I tend to hear about new technology late in the game. Just yesterday I asked the DH what TiVo is.)