numeron
A hypothetical nonverbal cognitive representation of a numeric amount.
Of course, it is also possible that Sheba's mental representations of 1, 2, 3, and 4 may have been symbolic, accumulator representations or numeron representations.
Where it comes from
From numero- + -on (“forming names of things considered as basic or fundamental units”). Coined in 1986 by Rochel Gelman and C. R. Gallistel.
Adapted from the Wiktionary entry numeron (CC BY-SA 4.0).