Sticker
from Fancyclopedia 2 ca. 1959
A little gummed piece of paper, usually less than 3" long and having space for maybe four lines of type. Sometimes applied to the letter sheet in lieu of letterhead, or more usually stuck to the envelope. It may carry the fan's name, one or more of his publication's titles, names of organizations, and descriptive words like "Scientifictionist"; others say "Member Suchandsuch Organization", plug a convention, Esperanto, flying saucers or some such thing, or maybe boost science fiction in general.
from Fancyclopedia 1 ca. 1944
A little gummed piece of paper, usually less long than 3" and having space for perhaps four lines of type. Sometimes applied to the letter sheet in lieu of letterhead, it is more usually stuck on the envelope, and may carry the fan's name, one or more of his publications' titles, names of organizations and descriptive words like "Scientifictionist"; others say -"Member —- suchandsuch org"-, plug a convention or Esperanto, or maybe plug science-fiction in general.