In expecco, an action block (or often referred to as "action" or "block for" short) provides the definition of an action. This can be either an elementary block or a compound block. A block can be placed several times as a step in another compound block, or as a test case within a test plan.
In literature the term "action" is used. Since it can be easily mixed up with "activity", this documentation uses the terms "block" or explicit "action block", "action definition" or "block description".