Resource Codes Many of the resources have a little code in the title. For example, B1.03. This is a very special, insider code that is only for members of the Kid-Inspired ESL Curriculum. . Alright, here is the top secret meaning of the codes: B1 = Beginners Level 1 (B2 would be Beginners Level 2) .03 = This is the unit number that the lesson comes from, in this case Unit 3. Other codes: Now... This message will self-destruct in 20 seconds.