[racket] htdp/2e: on the choice of some names

(*) Curiosity

1. I wonder what BS stands for in this definition.

; A BS is one of:
; — "hello",
; — "world", or
; — pi.

Is it just a synonym for nonsense?

2. I figure "MT" means "empty" because of how it sounds. Is that it?

; an empty scene:
(define MT (empty-scene 100 100))

3. I figure "posn" comes from the word "position". Is that it?

Thank you.
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