I am pretty sure IBM's "DisplayWriter" word processor used the "small house" char for some kind of an indicator in the status line, maybe something to do with tabs. Here's a screenshot I found of DisplayWriter using that char: https://darrengoossens.wordpress.com/wp-content/uploads/2020...
I did consider that, but the 1980 IBM Displaywriter uses a filled downwards triangle, not a house character, to indicate the center line [0].
But you're right that the Displaywriter inspited 1984 DisplayWrite DOS program [1] did use the house character for the same purpose. (Although, CP437 also included a filled downwards triangle character at 0x1F.)
