I'm trying to come up with a list of all possible currency
requirements that could possibly be calculated. This is what I have so
far:

SEL general
SEL night
MEL general
MEL night
SEL tailwheel general
SEL tailwheel night
MEL tailwheel general
MEL tailwheel night
SES general
SES night
MES general
MES night

instrument-airplane
instrument-helicopter
instrument-glider

After that it gets kind of confusing. There are a few other
categories, such as Powered Lift, Lighter-Than-Air, Weight-Shift, etc.
But I don't know if single-engine, sea, apply to them.

Is there a such thing as glider currency? Do you have to do 3 landings
within the last 90 days in a glider to carry passengers in a glider?
The FAR's define a glider as a category, but I can't find any mention
of glider currency anywhere on the internet.

Does anyone know of a comprehensive list somewhere that lays out each
and every category/class combo that the FAA recognizes?