Wow! Semiotics what a word!!
Here I'll use the definition given to me by Colm Hefferon.
Semiotics: The other visual and auditory elements of the drama, which the audience "reads" as well as the text. One may be sometimes unaware of these semiotic elements as an observer but the director can deepen and enrich a performance by the simple placing of an object or actor in a symbolic way.
The spectrum of presentation includes:
from Light <.....> Darkness
from Sound <.....> Silence
from Movement <.....> Stillness
Under semiotics then, comes engagement with symbols and images the "Poetic Action" of any drama. For example the uses that can be made of "Sheets". (Drama Circle workshop September 08)