While I agree it's very clear what "2" means in this context, it's off the pattern AWS has set with EC2 (Elastic Compute Cloud) and S3 (Simple Storage Service)

While I agree it's very clear what "2" means in this context, it's off the pattern AWS has set with EC2 (Elastic Compute Cloud) and S3 (Simple Storage Service) where the numbers are part of an arithmetic expression (S* 3 and E + C * 2).