[TUHS] Book Recommendation

[John Foust]

At 11:00 AM 11/16/2021, Douglas McIlroy wrote:
>>> The former notation C(B(A)) became A->B->C. This was PL/I's gift to C.
>
>> You seem to have a gift for notation. That's rare.  Curious what you think of APL?
>
>I take credit as a go-between, not as an inventor. Ken Knowlton
>introduced the notation ABC in BEFLIX, a pixel-based animation
>language. 

In BEFLIX, 'ABC' meant what, exactly?  Offsets from pixel locations?

- John