Yeah, that would be series.
One account of how the new band’s name was chosen held that Moon and Entwistle had suggested that a supergroup with Page and Beck would go down like a “lead balloon”, an idiom for disastrous results.[21] The group dropped the ‘a’ in lead at the suggestion of their manager, Peter Grant, so that those unfamiliar with the term would not pronounce it “leed”.[22] The word “balloon” was replaced by “zeppelin”, a word which, according to music journalist Keith Shadwick, brought “the perfect combination of heavy and light, combustibility and grace” to Page’s mind.[21]