Yes. As you define it....
The basic notion about tautological existence is its independence of any domain of discourse (it is logically unconditional existence, whether it is
discovered or not, or whether it is addressed according to the
invented rules of a given domain of discourse, or not).
Yet this
discovered tautological existence is the basis of the
invented rules of any domain of discourse that are used to define identities, properties, relations etc., which can't deduced without the independent platonic existence (which is independent of the moment of discovery, unlike the existence of the invented rules of a given domain of discourse, which depends on the moment of invention).
Two examples of such domains of discourse, are the rules of ZFC or the rules of WFF, where in both cases the invention of these rules are deduced from the
discovered tautological existence, but not vice versa.
In case of ZFC, the signature of the
discovered tautological existence is called set.
In case of WFF, the signature of the
discovered tautological existence is called term.
It has to be stressed that that if
invented rules of any given domain of discourse are related to the
discovered tautological existence, the result is always
invented things that do not have tautological existence.
Some example:
The square root of 9 is an
invented thing that does not have tautological existence, yet it is based on the
discovered tautological existence called number.
Generally, by using an extended notion of Reflection principle (
http://en.wikipedia.org/wiki/Absolute_Infinite ), concepts like, set, term, number etc. are some signatures of the
discovered tautological existence within given domains of discourse, which is not limited by any domain of discourse.