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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...

https://en.wikipedia.org/wiki/IBM_Displaywriter_System

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.)

[0]: https://youtu.be/YnU_woucebE?t=169

[1]: https://www.dosdays.co.uk/topics/Software/ibm_displaywrite.p...

Yup. That's what it looks like to me as well

That's what I always assumed it was, too.