Full Idea
I shall give the name 'sensibilia' to those objects which have the same metaphysical and physical status as sense-data without necessarily being data to any mind.
Gist of Idea
'Sensibilia' are identical to sense-data, without actually being data for any mind
Source
Bertrand Russell (The Relation of Sense-Data to Physics [1914], §III)
Book Reference
Russell,Bertrand: 'Mysticism and Logic' [Unwin 1989], p.143
A Reaction
This is his response to the problem of whether sense-data can exist independently of experience, which was unclear in 1912. Presumably sensibilia are objects which are possible sources of experience, but that seems to cover most objects.