After the R/M xxDM series, in late 2014, a new numbering began for these plates.
The first letter of the suffix now corresponds to the team.
E = Giants


2018

F = Jets

2016

G = Eagles

2017

2017Joe Pugliese

J = Mets


c.2018

L = Yankees


2018

2019

2020

M = DevilsOriginal wordmark

New wordmark

2017

2018

N = Flyers

Jaska Börner

2018

PA-PL = 76ers

PM-PZ = Knicks


R = NASCAR


U = NASCAR - Ford Racing
Lee Madigan

Braden Moore

The second suffix letter on some of these plates has jumped from the A, B, C etc. series to the M, N series, or maybe started at M rather than A.
I don't know why the jump occurred.
It's more difficult to track numbers now, as all of the suffixes are being issued simultaneously.