This page refers to the native Elrond currency called eGold. The old ERD currency underwent a redenomination of 1000 ERD:1 eGLD, and name change from ERD to eGLD, which is short for eGold. The new eGLD is 1000x larger than the old ERD. There is no difference between eGLD and ERD except for their name and denomination. See Elrond's blog post for more information.