Design does not mean signature.

Design definition:

n. Design, layout, arrangement; design art, conception; design drawings, drawings; patterns, patterns; plans, intentions

v .Design, drawing, conception; planning, formulation; reservation, designation

Phrases:

product design?product design

engineering design?engineering design

structure design?structural design

Example:

The product is at the design stage.

The product is in the design stage.

Word analysis:

The words intention, intent, and design all mean "intention, attempt". The difference is:

Intention is a common word , refers to someone’s inner thought of wanting to do something, focusing on inner activities.

Intent is a legal term that often refers to someone committing a crime with malicious intent.

Design is often used in the plural form, and it has a derogatory connotation and mostly refers to the intention of bad behavior.