Their experts look into a business's situation and identify a bond score for the business. Every rating service has its own formula for determining threat and its own sort of ranking scale. Typically, rating scales are defined in letter grades, where an AAA score designates a safe, low-risk bond, and a D rating designates a high-risk bond.government bonds, are normally low-yield bonds. You can depend on getting a payout but that payout will be little. what does a bond can be called finance. On the other side of the spectrum, you have what's not-so-affectionately called, which are low-rated, high-risk bonds. In order to lure financiers into purchasing these risky scrap bonds, the providing companies guarantee high yields.