What is the meaning of "--" spam score?

[agalhom]

What is the meaning of "--" spam score?

[drcan8]

spam score is a degree to bad practice on pang , off page site , liks use keywords as many tims , build backlink with software like GSA , of make a cloacking page

[Martijn_Scheijbeler]

Very simple: It's just not available for that site. It basically means that the site is not in the index from Moz.