CPL (the direct ancestor of BCPL) also had a form of `//` comments. Quoting from the manual: > A comment is introduced by a double bar and continues up to the

CPL (the direct ancestor of BCPL) also had a form of `//` comments. Quoting from the manual: > A comment is introduced by a double bar and continues up to the end of that line; the whole of this text is ignored. The double bar was written as `||`. This information comes from the "CPL Working Papers", July 1966.