The next term in the series is QGR.
To find the missing term, analyze the pattern for each position (first, second, and third letters) across the series: EON, HMO, KKP, NIQ, ?
* First Letter Pattern:
E+3H+3K+3N+3Q
(E=5, H=8, K=11, N=14, Q=17)
* Second Letter Pattern:
O−2M−2K−2I−2G
(O=15, M=13, K=11, I=9, G=7)
* Third Letter Pattern:
N+1O+1P+1Q+1R
(N=14, O=15, P=16, Q=17, R=18)
Combining these letters gives the final answer: QGR.