According to Dennis Ritchie, the name is an allusion to the DD statement found i...

axiolite 5 months ago | parent | context | favorite | on: Postgres Postmaster does not scale

    According to Dennis Ritchie, the name is an allusion to the DD statement found in IBM's Job Control Language (JCL), where DD is short for data definition  https://en.wikipedia.org/wiki/Dd_%28Unix%29#History