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What do the codes in Box 12 on my W-2 mean?

Employer Use Codes:

A Uncollected Social Security tax on tips.
B Uncollected Medicare tax on tips.
C Cost of group term life insurance coverage over $50,000.
D Elective deferrals to a Section 401(k) cash or deferred arrangement.
E Elective deferrals to a Section 403(b) salary reduction agreement.
F Elective deferrals to a Section 408(k) salary reduction SEP.
G Elective and non-elective deferrals to a Section 457(b) deferred compensation plan.
H Elective deferrals to a Section 501(c)(18)(D) tax-exempt organization plan.
J Nontaxable sick pay.
K 20% excise tax on excess golden parachute payments.
L Nontaxable part of employee business expense reimbursements.
M Uncollected Social Security tax on cost of group term life insurance coverage over $50,000 (former employees only).
N Uncollected Medicare tax on cost of group term life insurance coverage over $50,000 (former employees only).
P Excluded reimbursed moving expenses.
Q Combat pay.
R Employer contributions to an Archer MSA.
S Employee salary reduction contributions to Section 408(p) SIMPLE.
T Adoption benefits.
V Income from the exercise of nonstatutory stock options. This code has no tax effect - amount should already be reported in boxes 1, 3 & 5 by the employer.
W Employer contribution to an employee's Health Savings Account (HSA).
Y Deferrals under a section 409A on a nonqualified deferred compensation plan.
Z Income under section 409A on a nonqualified deferred compensation plan.
AA Designated Roth contributions to a section 401(k) plan.
BB Designated Roth contributions under a 403(B) salary reduction agreement.
DD Cost of Employer-Sponsored Health Coverage.
EE Roth contribution under Section 457(b).
II Nontaxable Medicaid waiver payments.