An LOC meets the basic definition of a revolving line of credit, in that it sets a credit limit upon which the consumer can decide how much to use, and payments then revolve around the debt balance. They are normally included in scoring of revolving accounts.
However, FICO does make a scoring exception for certain higher-limit lines of credit, such as a HELOC.
If the balance is above approx. $35K, they may revert to scoring under installment accounts even though they are technically a revolving line of credit.