In automated systems, they are represented by what can be referred to generically as electronic signatures.
Electronic signatures are used with automated systems.
Automated systems cannot use electronic signatures.
A boy is doing jumping jacks.
A man and woman are walking on sand.
I see where you are coming from.
Menes had a pyramid built to the sky but could have used the natural columns they were there.
The woman wears a short skirt.
The dog is getting a bath.