During my first fundamentals class with collage freshman we would explore the stage using this list of terms.
1.
Center line
2.
Plaster line
3.
Proscenium arch
4.
Arena
5.
Thrust
6.
Apron
7.
Downstage
8.
Upstage
9.
Stage right
10.
Center stage
11.
Stage left
12.
Offstage
13.
On stage
14.
Best seat in the house
15.
Worst seat in the house
16.
Sightlines
17.
Orchestra pit
18.
Stage floor
19.
Show deck
20.
Main curtain
21
Pipe batten
22.
Battens
23.
Arbor
24.
Lift lines
25.
Weights
26.
Guide rails
27.
Operating line
28.
Rope lock
29.
Wings
30.
Masking
31.
Border
32.
Leg
33.
Backdrop
34.
Grommet
35.
Webbing
36.
Side hem
37.
Pipe pocket
38.
Pin rail
39.
Sandbag
40.
Grid
41
Loft block
42.
Head block
43.
Tension block
44.
Traps
45.
Trap room