To ascertain the count of consonant letters in the English alphabet that exhibit vertical axis symmetry, we first enumerate the uppercase consonants: B, C, D, F, G, H, J, K, L, M, N, P, Q, R, S, T, V, W, X, Y, Z.
Subsequently, we identify the subset of these consonants that are vertically symmetrical:
Upon enumeration of these symmetrical consonants, the total is determined to be 11.
Consequently, the result is 11.