Concept:
Silk screen printing is a printmaking technique in which ink is transferred through a mesh screen onto a surface.
This technique is also known as:
\[
\text{Serigraphy}
\]
The word “Serigraphy” comes from:
\[
\text{Seri} = \text{Silk}
\]
\[
\text{Graphy} = \text{Writing or drawing}
\]
Step 1: Understand silk screen technique.
In silk screen printing, a stencil is prepared on a screen.
Ink is pushed through the open areas of the screen onto paper, cloth, canvas or another surface.
Step 2: Identify the correct technical term.
The technical name of silk screen printing is:
\[
\text{Serigraphy}
\]
It is commonly used in modern printmaking and graphic art.
Step 3: Check the other options.
Planography is related to flat-surface printing.
Lithography is printing from stone or metal plate.
Viscosity printing is related to different ink viscosities.
Therefore, these are not the correct terms for silk screen printing.
Step 4: Final conclusion.
Hence, the correct answer is:
\[
\boxed{\text{Serigraphy}}
\]