Flags are what are assigned to each character which allows them to do things like spawn props, npcs, use a physgun, toolgun, and buy weapons in the business menu. Below are a list of them. Flags stay on your character forever until you remove them.

C Access to spawn vehicles.
Y Access to the heavy blackmarket items.
y Access to the light blackmarket items.
c Access to spawn chairs.
e Access to spawn props.
n Access to spawn NPCs.
p Access to the physgun.
r Access to spawn ragdolls.
t Access to the toolgun

Use the commands /flaggive character flagletter(s) to give a character a flag or flags
EX. /flaggive CP-RCT.34562 p

now that CP recruit has a physgun forever

EX. /flaggive CP-RCT.34562 CYycentrp

Now the CP has every flag, that's crazy

/flagtake character flagletter(s) to revoke a flag or flags from a character