2005, Anat Rafaeli, Michael G. Pratt, Artifacts and Organizations: Beyond Mere Symbolism‎, p. 272:Boilerplate contracts provide an easily modified template that can serve as a basis for drafting a final signable contract.
Available for the posting of signs.
1971, William R Ewald, Daniel R Mandelker, Street graphics: a concept and a systemIn commercial/industrial areas, wall graphics pertaining to commercial or industrial activities may occupy 40 percent of the signable area...
(sports) Capable of being signed, or recruited by a sports club.a signable player